Work profit & loss
Question No 1
Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is
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Solution!
Ratio of times taken by Sakshi and Tanya = 125/100 = 5/4! !Suppose Tanya takes x days to do the work.! !5/4 = 20/x!x = (4*20)/5! !x = 16 days.! !Hence, Tanya takes 16 days to complete the work..
Ratio of times taken by Sakshi and Tanya = 125/100 = 5/4! !Suppose Tanya takes x days to do the work.! !5/4 = 20/x!x = (4*20)/5! !x = 16 days.! !Hence, Tanya takes 16 days to complete the work..
Question No 2
In a fort there is enough food sufficient for 1200 men for 10 days. How long the food would have last for if there would have been 1000 men.
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Solution!
Let food will last for x days.!As men and days are inversely proportional to each other so!x/10 = 1200/1000!x = 12! !Hence food will last for 12 days if there were 1000 men..
Let food will last for x days.!As men and days are inversely proportional to each other so!x/10 = 1200/1000!x = 12! !Hence food will last for 12 days if there were 1000 men..
Question No 3
A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?
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Solution!
Whole work is done by A in (20 * 5/4) = 25 days! !Now, (1 - 4/5) i.e., 1/5 work is done by A and B in 3 days.! !Whole work will be done by A and B in (3 x 5) = 15 days.! !A's 1 day's work = 1/25!(A + B)'s 1 day's work = 1/15! !So, B's 1 day's work = (1/15 - 1/25) = 4/150 = 2/75! !Hence, B alone would do the work in 75/2 = 37.5 days..
Whole work is done by A in (20 * 5/4) = 25 days! !Now, (1 - 4/5) i.e., 1/5 work is done by A and B in 3 days.! !Whole work will be done by A and B in (3 x 5) = 15 days.! !A's 1 day's work = 1/25!(A + B)'s 1 day's work = 1/15! !So, B's 1 day's work = (1/15 - 1/25) = 4/150 = 2/75! !Hence, B alone would do the work in 75/2 = 37.5 days..
Question No 4
A can do a certain work in the same time in which B and C together can do it.If A and B together could do it in 10 days and C alone in 50 days,then B alone could do it in
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Solution!
(A + B)'s 1 day's work = 1/10! !C's 1 day's work = 1/50! !(A + B + C)'s 1 day's work = (1/10 + 1/50) = 6/50 = 3/25...(1)! !A's 1 day's work = (B + C)'s 1 day's work .... (2)! !From (1) and (2), we get!2 * (A's 1 day's work) = 3/25! !A's 1 day's work = 3/50! !So, B's 1 day's work (1/10 - 3/50) = 2/50 = 1/25! !Hence, B alone could do the work in 25 days..
(A + B)'s 1 day's work = 1/10! !C's 1 day's work = 1/50! !(A + B + C)'s 1 day's work = (1/10 + 1/50) = 6/50 = 3/25...(1)! !A's 1 day's work = (B + C)'s 1 day's work .... (2)! !From (1) and (2), we get!2 * (A's 1 day's work) = 3/25! !A's 1 day's work = 3/50! !So, B's 1 day's work (1/10 - 3/50) = 2/50 = 1/25! !Hence, B alone could do the work in 25 days..
Question No 5
Cost price of a camera was $430 and it was sold at profit of 16%. What is its selling price?
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Solution!
16% of 430 = (430*16)/100 = 68.8! !Selling price = 430 + 68.8 = 498.8.
16% of 430 = (430*16)/100 = 68.8! !Selling price = 430 + 68.8 = 498.8.
Question No 6
An estate agent sold a property at a profit of 10% for $825000. What was cost price of the property?
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Solution!
Let cost price of the property is x.!10% of x = 10x/100 = x/10! !Now!825000 - (x/10) = x!8250000 - x = 10x!8250000 = 11x!x = 750000! !Hence cost price of the property is $750000..
Let cost price of the property is x.!10% of x = 10x/100 = x/10! !Now!825000 - (x/10) = x!8250000 - x = 10x!8250000 = 11x!x = 750000! !Hence cost price of the property is $750000..
Question No 7
John sold a house for $494500 at a profit of 15%. How much did he pay for it?
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Solution!
Let cost price of the house is x.!15% of x = 15x/100 = 3x/20! !Now!494500 - (3x/20) = x!9890000 -3x = 20x!9890000 = 23x!x = 430000! !Hence cost price of the house is $430000..
Let cost price of the house is x.!15% of x = 15x/100 = 3x/20! !Now!494500 - (3x/20) = x!9890000 -3x = 20x!9890000 = 23x!x = 430000! !Hence cost price of the house is $430000..
Question No 8
Ali sold a house at a loss of 15% for Rs. 382500. What was the cost price of the house?
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Solution!
Let cost price of the house is x.!15% of x = 15x/100 = 3x/20! !Now!(3x/20)+382500 = x!3x + 7650000 = 20x!7650000 = 17x!x = 450000!Hence cost price of the house is Rs. 450000.
Let cost price of the house is x.!15% of x = 15x/100 = 3x/20! !Now!(3x/20)+382500 = x!3x + 7650000 = 20x!7650000 = 17x!x = 450000!Hence cost price of the house is Rs. 450000.
Question No 9
X can do a piece of work in 40 days.He works at it for 8 days and then Y finished it in 16 days.How long will they together take to complete the work?
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Solution!
Work done by X in 8 days = (1/40 * 8)!= 1/5! !Remaining work = (1 - 1/5)!4/5! !Now, 4/5 work is done by Y in 16 days.! !Whole work will be done by Y in (16 * 5/4)!= 20 days! !So,!X's 1 day's work = 1/40!Y's 1 day's work = 1/20! !(X + Y)'s 1 day's work = (1/40 + 1/20) = 3/40! !Hence, X and Y will together complete the work in 40/3 days.
Work done by X in 8 days = (1/40 * 8)!= 1/5! !Remaining work = (1 - 1/5)!4/5! !Now, 4/5 work is done by Y in 16 days.! !Whole work will be done by Y in (16 * 5/4)!= 20 days! !So,!X's 1 day's work = 1/40!Y's 1 day's work = 1/20! !(X + Y)'s 1 day's work = (1/40 + 1/20) = 3/40! !Hence, X and Y will together complete the work in 40/3 days.
Question No 10
25 tailors can make 35 dresses in 1 day. How many dresses can 6 tailors make in 5 days?
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Solution!
Let x dresses can be made.!As dresses are directly proportional to tailors and days so!x/35 = (6/25)*(5/1)!x = 42! !Hence 42 dresses can be made by 6 tailors in 5 days..
Let x dresses can be made.!As dresses are directly proportional to tailors and days so!x/35 = (6/25)*(5/1)!x = 42! !Hence 42 dresses can be made by 6 tailors in 5 days..
Question No 11
A is thrice as good as a workman as B and therefore is able to finish a job in 60 days less than B.Working together,they can do it in
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Solution!
Ratio of times taken by A and B = 1/3! !The time difference is (3 - 1) 2 days while B take 3 days and A takes 1 day.! !If difference of time is 2 days, B takes 3 days.! !If difference of time is 60 days, B takes (3/2 * 60) = 90 days! !So, A takes 30 days to do the work.! !A's 1 day's work = 1/30! !B's 1 day's work = 1/90! !(A + B)'s 1 day's work = (1/30 + 1/90) = 4/90 = 2/45! !Hence, A and B together can do the work in 45/2 = 22.5 days.
Ratio of times taken by A and B = 1/3! !The time difference is (3 - 1) 2 days while B take 3 days and A takes 1 day.! !If difference of time is 2 days, B takes 3 days.! !If difference of time is 60 days, B takes (3/2 * 60) = 90 days! !So, A takes 30 days to do the work.! !A's 1 day's work = 1/30! !B's 1 day's work = 1/90! !(A + B)'s 1 day's work = (1/30 + 1/90) = 4/90 = 2/45! !Hence, A and B together can do the work in 45/2 = 22.5 days.
Question No 12
A man buys a cycle for Rs. 1400 and sells it at a loss of 15%. What is the selling price of the cycle?
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Solution!
S.P. = 85% of Rs. 1400 =(85/100)*1400!=Rs. 1190.
S.P. = 85% of Rs. 1400 =(85/100)*1400!=Rs. 1190.
Question No 13
A works twice as fast as B.If B can complete a work in 12 days independently,The number of days in which A and B can together finish the work in
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Solution!
Ratio of rates of working of A and B = 2/1! !So, ratio of times taken = 1/2! !B's 1 day's work = 1/12! !A's 1 day's work = 1/6!(2 times of B's work)! !(A + B)'s 1 day's work = (1/6 + 1/12) = 1/4! !So, A and B together can finish the work in 4 days..
Ratio of rates of working of A and B = 2/1! !So, ratio of times taken = 1/2! !B's 1 day's work = 1/12! !A's 1 day's work = 1/6!(2 times of B's work)! !(A + B)'s 1 day's work = (1/6 + 1/12) = 1/4! !So, A and B together can finish the work in 4 days..
Question No 14
A can finish a work in 18 days and B can do the same work in 15 days. B worked for 10 days and left the job. In how many days, A alone can finish the remaining work?
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Solution!
B's 10 day's work = (1/15 * 10) = 2/3! !Remaining work = (1 - 2/3) = 1/3! !Now, 1/18 work is done by A in 1 day.! ! Hence, 1/3 work is done by A in (18 * 1/3) = 6 days..
B's 10 day's work = (1/15 * 10) = 2/3! !Remaining work = (1 - 2/3) = 1/3! !Now, 1/18 work is done by A in 1 day.! ! Hence, 1/3 work is done by A in (18 * 1/3) = 6 days..
Question No 15
If selling price is doubled, the profit triples. Find the profit percent.
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Solution!
Let! C.P. be Rs. x and S.P. be Rs. y.! !Then,! 3(y - x) = (2y - x)!y = 2x! !Profit = Rs. (y - x) = Rs. x! !Profit % = (x/x)*100 = 100%.
Let! C.P. be Rs. x and S.P. be Rs. y.! !Then,! 3(y - x) = (2y - x)!y = 2x! !Profit = Rs. (y - x) = Rs. x! !Profit % = (x/x)*100 = 100%.
Question No 16
An article was bought for $300 and sold at a loss of 8%. What is the selling price of the article?
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Solution!
8% of 300!= (300*8)/100 = 24! !Selling price = 300-24 = 276.
8% of 300!= (300*8)/100 = 24! !Selling price = 300-24 = 276.
Question No 17
9 excavators working 10 hours a day remove 2500 cubic feet of earth in 3 days. How many excavators working 6 hours a day are required to remove 5000 cubic feet of earth in 2 days?
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Solution!
Let x excavators are required.!As excavators are inversely proportional to hours and days and directly proportional to work progress so!x/9 = (10/6)*(5000/2500)*(3/2)!x = 45! !Hence 45 excavators are required to remove 5000 cubic feet of earth..
Let x excavators are required.!As excavators are inversely proportional to hours and days and directly proportional to work progress so!x/9 = (10/6)*(5000/2500)*(3/2)!x = 45! !Hence 45 excavators are required to remove 5000 cubic feet of earth..
Question No 18
What will be the selling price of an article that was bought for $1150 and sold at profit of 6%?
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Solution!
6% of 1150!= (1150*6)/100 = 69! !Selling price = 1150+69 = 1219.
6% of 1150!= (1150*6)/100 = 69! !Selling price = 1150+69 = 1219.
Question No 19
A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in
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Solution!
(B + C)'s 1 day's work = (1/9 + 1/12) = 7/36! !Work done by B and C in 3 days = (7/36 * 3)!= 7/12! !Remaining work = (1 - 7/12)!= 5/12! !Now, 1/24 work is done by A in 1 day.! !So, 5/12 work is done by A in (24 * 5/12) = 10 days..
(B + C)'s 1 day's work = (1/9 + 1/12) = 7/36! !Work done by B and C in 3 days = (7/36 * 3)!= 7/12! !Remaining work = (1 - 7/12)!= 5/12! !Now, 1/24 work is done by A in 1 day.! !So, 5/12 work is done by A in (24 * 5/12) = 10 days..
Question No 20
By selling a Television for $572 Adam lost 12%. What was the cost price of the television?
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Solution!
Let cost price of the television is x.!12% of x = 12x/100 = 3x/25! !Now!(3x/25)+572 = x!3x + 14300 = 25x!14300 = 22x!x = 650! !Hence cost price of the television is $650..
Let cost price of the television is x.!12% of x = 12x/100 = 3x/25! !Now!(3x/25)+572 = x!3x + 14300 = 25x!14300 = 22x!x = 650! !Hence cost price of the television is $650..
Question No 21
By selling an article for $200 shopkeeper looses 20%. What is cost price of the article?
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Solution!
Let cost price of the article is x.! !20% of x = (x*20)/100 = x/5! !Now!(x/5) + 200 = x!x+1000 = 5x!4x = 1000!x = 250! !Hence cost price of the article is 250..
Let cost price of the article is x.! !20% of x = (x*20)/100 = x/5! !Now!(x/5) + 200 = x!x+1000 = 5x!4x = 1000!x = 250! !Hence cost price of the article is 250..
Question No 22
Ali bought a house for $450000 and sold it for $500000. What is his profit percentage?
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Solution!
Profit = 500000-450000 = 50000! !Profit percentage= (50000/450000)*100 = 11.11%.
Profit = 500000-450000 = 50000! !Profit percentage= (50000/450000)*100 = 11.11%.
Question No 23
On selling 17 balls at $720, there is a loss equal to the cost price of 5 balls.The cost price of a ball is
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Solution!
(C.P. of 17 balls) - (S.P. of 17 balls) = (C.P. of 5 balls)! !C.P. of 12 balls = S.P. of 17 balls = $720! !C.P. of 1 ball = $60.
(C.P. of 17 balls) - (S.P. of 17 balls) = (C.P. of 5 balls)! !C.P. of 12 balls = S.P. of 17 balls = $720! !C.P. of 1 ball = $60.
Question No 24
An article was sold at a loss of 15% for $476. What is the cost price of the article?
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Solution!
Let cost price of the article is x.!15% of x = (15x)/100 = 3x/20! !Now!(3x/20) + 476 = x!3x+9520 = 20x!9520 = 17x!x = 560! !Hence cost price of the article is $560..
Let cost price of the article is x.!15% of x = (15x)/100 = 3x/20! !Now!(3x/20) + 476 = x!3x+9520 = 20x!9520 = 17x!x = 560! !Hence cost price of the article is $560..
Question No 25
A trader mixes 26 kg of rice at Rs. 20 per kg with 30 kg of rice of other variety at Rs. 36 per kg and sells the mixture at Rs. 30 per kg.His profit percent is
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Solution!
C.P. of 56 kg rice = (26 x 20 + 30 x 36) = (520 + 1080) = Rs. 1600! !S.P. of 56 kg rice = Rs. (56 x 30) = Rs. 1680! !Hence, Gain = (80/1600)*100 = 5%.
C.P. of 56 kg rice = (26 x 20 + 30 x 36) = (520 + 1080) = Rs. 1600! !S.P. of 56 kg rice = Rs. (56 x 30) = Rs. 1680! !Hence, Gain = (80/1600)*100 = 5%.
Question No 26
With an increase of 12% salary of Ali became Rs13440. What was his salary before increase?
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Solution!
Let before increase Ali's salary was x.!12% of x = 12x/100 = 3x/25! !Now!13440 - 3x/25 = x!336000 - 3x = 25x!336000 = 28x!x = 12000! !Hence Ali's salary before increase was Rs. 12000.
Let before increase Ali's salary was x.!12% of x = 12x/100 = 3x/25! !Now!13440 - 3x/25 = x!336000 - 3x = 25x!336000 = 28x!x = 12000! !Hence Ali's salary before increase was Rs. 12000.
Question No 27
4 men and 6 women can complete a work in 8 days, while 3 men and 7 women can complete it in 10 days. In how many days will 10 women complete it?
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Solution!
Let, 1 man's 1 day's work = x!and!1 woman's 1 day's work = y! !Then, 4x + 6y = 1/8 nd 3x + 7y = 1/10! !Solving the two equations, we get!x = 11/400!y = 1/400! !So, One woman's 1 day's work = 1/400! !10 women's 1 day's work = (1/400 * 10) = 1/40! !Hence, 10 women will complete the work in 40 days..
Let, 1 man's 1 day's work = x!and!1 woman's 1 day's work = y! !Then, 4x + 6y = 1/8 nd 3x + 7y = 1/10! !Solving the two equations, we get!x = 11/400!y = 1/400! !So, One woman's 1 day's work = 1/400! !10 women's 1 day's work = (1/400 * 10) = 1/40! !Hence, 10 women will complete the work in 40 days..
Question No 28
By selling an article for $84 shopkeeper earns 12% profit. What was cost price of the article?
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Solution!
Let cost price of the article is x.!12% of x = 12x/100 = 3x/25! !Now!84 - (3x/25) = x!2100 - 3x = 25x!2100 = 28x!x = 75! !Hence cost price of the article is $75..
Let cost price of the article is x.!12% of x = 12x/100 = 3x/25! !Now!84 - (3x/25) = x!2100 - 3x = 25x!2100 = 28x!x = 75! !Hence cost price of the article is $75..
Question No 29
A shopkeeper expects a gain of 22.5% on his cost price. If in a week, his sale was of Rs. 392, what was his profit?
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Solution!
C.P. = (100/122.5) * 392!= (1000/1225) * 392!= Rs. 320! !Hence, Profit = Rs. (392 - 320) = Rs. 72..
C.P. = (100/122.5) * 392!= (1000/1225) * 392!= Rs. 320! !Hence, Profit = Rs. (392 - 320) = Rs. 72..
Question No 30
John's income increased from $12000 to $14400. What is percentage increase in his income?
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Solution!
Increase in income = 14400 - 12000 = 2400! !Percentage increase = (2400/12000)*100 = 20%.
Increase in income = 14400 - 12000 = 2400! !Percentage increase = (2400/12000)*100 = 20%.
Question No 31
A and B can do a job together in 7 days. A is 7/4 times as efficient as B.The same job can be done by A alone in
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Solution!
(A's 1 day's work) / (B's 1 day's work) = 7/4! !Let A's and B's 1 day's work be 7x and 4x respectively.! !Then,!7x + 4x = 1/7!11x = 1/7!x = 1/77! !Hence, A's 1 day's work = (1/77 * 7) = 1/11.
(A's 1 day's work) / (B's 1 day's work) = 7/4! !Let A's and B's 1 day's work be 7x and 4x respectively.! !Then,!7x + 4x = 1/7!11x = 1/7!x = 1/77! !Hence, A's 1 day's work = (1/77 * 7) = 1/11.
Question No 32
The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, then the value of x is
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Solution!
Let!C.P. of each article be Re. 1 C.P. of x articles = Rs. x.! !S.P. of x articles = Rs. 20.! !Profit = Rs. (20 - x)! !So, (20-x)/x * 100 = 25!2000 - 100x = 25x!125x = 2000! !Hence, x = 16.
Let!C.P. of each article be Re. 1 C.P. of x articles = Rs. x.! !S.P. of x articles = Rs. 20.! !Profit = Rs. (20 - x)! !So, (20-x)/x * 100 = 25!2000 - 100x = 25x!125x = 2000! !Hence, x = 16.
Question No 33
A, B and C can complete a piece of work in 24, 6 and 12 days respectively.Working together,they will complete the same work in
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Solution!
As we know that!If A can do a piece of work in n days, then A's 1 day's work = 1/n! !(A + B + C)'s 1 day's work = (1/24 + 1/6 + 1/12) = 7/24! !If A's 1 day's work = 1/n then,!A can finish the work in 'n' days.! !So, all the three together will complete the job in (24/7) days..
As we know that!If A can do a piece of work in n days, then A's 1 day's work = 1/n! !(A + B + C)'s 1 day's work = (1/24 + 1/6 + 1/12) = 7/24! !If A's 1 day's work = 1/n then,!A can finish the work in 'n' days.! !So, all the three together will complete the job in (24/7) days..
Question No 34
What will be the selling price of an article that was bought for $350 and sold at a loss of 14%?
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Solution!
14% of 350!(350*14)/100 = 49! !selling price of the article = 350 - 49 = 301.
14% of 350!(350*14)/100 = 49! !selling price of the article = 350 - 49 = 301.
Question No 35
By selling a car for Rs. 495000 an agent gains 10%. What was his cost?
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Solution!
Let cost price of the car is x.!10% of x = 10x/100 = x/10! !Now!495000 - (x/10) = x!4950000 - x = 10x!4950000 = 11x!x = 450000.
Let cost price of the car is x.!10% of x = 10x/100 = x/10! !Now!495000 - (x/10) = x!4950000 - x = 10x!4950000 = 11x!x = 450000.
Question No 36
In a ship the provisions are sufficient for 800 men for 50 days. How long will these be sufficient for if there would have been 200 more men?
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Solution!
Let provisions will be sufficient for 200 men for x days.!As men and days are inversely proportional to each other so!x/50 = 800/1000!x = 40! !Hence provisions will be sufficient for 200 men for 40 days..
Let provisions will be sufficient for 200 men for x days.!As men and days are inversely proportional to each other so!x/50 = 800/1000!x = 40! !Hence provisions will be sufficient for 200 men for 40 days..
Question No 37
Price of a car increased from $400000 to $420000. What is the percentage increase?
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Solution!
Increase in price = 420000 - 400000! = 20000! !Percentage increase = (20000/400000)*100! = 5%.
Increase in price = 420000 - 400000! = 20000! !Percentage increase = (20000/400000)*100! = 5%.
Question No 38
10 women can complete a work in 7 days and 10 children take 14 days to complete the work.How many days will 5 women and 10 children take to complete the work?
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Solution!
1 woman's 1 day's work =1/70! !1 child's 1 day's work =1/140! !(5 women + 10 children)'s 1 day's work = (5/70 + 10/140) = (1/14 + 1/14) = 1/7! !Hence, 5 women and 10 children will complete the work in 7 days..
1 woman's 1 day's work =1/70! !1 child's 1 day's work =1/140! !(5 women + 10 children)'s 1 day's work = (5/70 + 10/140) = (1/14 + 1/14) = 1/7! !Hence, 5 women and 10 children will complete the work in 7 days..
Question No 39
A group of workers can do a piece of work in 24 days. However as 7 of them were absent it took 30 days to complete the work. How many people actually worked on the job to complete it?
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Solution!
Let x workers are required to complete the job.!As workers and days are inversely proportional to each other so!(x-7)/x = 24/30!30x - 210 = 24x!6x = 210!x = 35! !Hence 35 workers are required to complete the job in time..
Let x workers are required to complete the job.!As workers and days are inversely proportional to each other so!(x-7)/x = 24/30!30x - 210 = 24x!6x = 210!x = 35! !Hence 35 workers are required to complete the job in time..
Question No 40
Price of a fuel increased by 10% during budget. If its price before budget was Rs. 55 per liter what is its price after the budget?
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Solution!
10% of 55 = (55*10)/100 = 5.5! !Price of fuel after butget = 55+5.5 = 60.5.
10% of 55 = (55*10)/100 = 5.5! !Price of fuel after butget = 55+5.5 = 60.5.
Question No 41
A salesman bought a pen for Rs. 100 and sold it for Rs. 110. What is his profit percent?
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Solution!
Profit = 110 - 100 = 10! !Profit percentage = (10/100)*100 = 10%.
Profit = 110 - 100 = 10! !Profit percentage = (10/100)*100 = 10%.
Question No 42
A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 20%?
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Solution!
C.P. of 6 toffees = Re. 1! !S.P. of 6 toffees = 120% of Re. 1 = Rs. 6/5! !For Rs. 6/5,!toffees sold = 6.! !For Re. 1, toffees sold = (6 * 5/6) = 5.
C.P. of 6 toffees = Re. 1! !S.P. of 6 toffees = 120% of Re. 1 = Rs. 6/5! !For Rs. 6/5,!toffees sold = 6.! !For Re. 1, toffees sold = (6 * 5/6) = 5.
Question No 43
Price of an article decreased from $70 to $56. What is the percentage decrease?
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Solution!
Decrease in price = 70-56 = 14! !Percentage decrease = (14/70)*100 = 20%.
Decrease in price = 70-56 = 14! !Percentage decrease = (14/70)*100 = 20%.
Question No 44
A shopkeeper bought an article for $120 and sold at profit of 10%. What is selling price of the article?
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Solution!
10% of 120!= (120*10)/100 = 12! !Selling price = 120+12 = 132.
10% of 120!= (120*10)/100 = 12! !Selling price = 120+12 = 132.
Question No 45
A and B can do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in
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Solution!
(A + B + C)'s 1 day's work = 1/6! !(A + B)'s 1 day's work = 1/8! !(B + C)'s 1 day's work = 1/12! !So, (A + C)'s 1 day's work = (2* 1/6) - (1/8 + 1/12)!= (1/3 - 5/24) = (3/24) = 1/8! !So, A and C together will do the work in 8 days..
(A + B + C)'s 1 day's work = 1/6! !(A + B)'s 1 day's work = 1/8! !(B + C)'s 1 day's work = 1/12! !So, (A + C)'s 1 day's work = (2* 1/6) - (1/8 + 1/12)!= (1/3 - 5/24) = (3/24) = 1/8! !So, A and C together will do the work in 8 days..
Question No 46
A car was bought for $380000 four years ago and during these four year it price decreases by 12%. What is its value now?
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Solution!
12% of 380000!(380000/100)*12 = 45600! !Price of the car = 380000 - 45600 = 334400.
12% of 380000!(380000/100)*12 = 45600! !Price of the car = 380000 - 45600 = 334400.
Question No 47
A can do a work in 15 days and B in 20 days.If they work on it together for 4 days,then the fraction of the work that is left is
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Solution!
A's 1 day's work = 1/15! !B's 1 day's work = 1/20! !(A + B)'s 1 day's work = (1/15 + 1/20) = 7/60! !(A + B)'s 4 day's work = (7/60 * 4) = 7/15! !Therefore, Remaining work = (1 - 7/15) = 8/15.
A's 1 day's work = 1/15! !B's 1 day's work = 1/20! !(A + B)'s 1 day's work = (1/15 + 1/20) = 7/60! !(A + B)'s 4 day's work = (7/60 * 4) = 7/15! !Therefore, Remaining work = (1 - 7/15) = 8/15.
Question No 48
A can do a piece of work in 4 hours; B and C together can do it in 3 hours,while A and C together can do it in 2 hours.How long will B alone take to do it?
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Solution!
A's 1 hour's work = 1/4! !(B + C)'s 1 hour's work = 1/3! !(A + C)'s 1 hour's work = 1/2! !(A + B + C)'s 1 hour's work = (1/4 + 1/3) = 7/12! !B's 1 hour's work = (7/12 - 1/2) = 1/12! !Hence, B alone will take 12 hours to do the work..
A's 1 hour's work = 1/4! !(B + C)'s 1 hour's work = 1/3! !(A + C)'s 1 hour's work = 1/2! !(A + B + C)'s 1 hour's work = (1/4 + 1/3) = 7/12! !B's 1 hour's work = (7/12 - 1/2) = 1/12! !Hence, B alone will take 12 hours to do the work..
Question No 49
A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days?
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Solution!
Ratio of times taken by A and B = 100/130 = 10/13! !Suppose B takes x days to do the work.! !Then, 10/13 = 23/x!x = (23*13)/10!x = 299/10! !A's 1 day's work = 1/23! !B's 1 day's work = 10/299! !(A + B)'s 1 day's work = (1/23 + 10/299) = 23/299 = 1/13! !Therefore, A and B together can complete the work in 13 days..
Ratio of times taken by A and B = 100/130 = 10/13! !Suppose B takes x days to do the work.! !Then, 10/13 = 23/x!x = (23*13)/10!x = 299/10! !A's 1 day's work = 1/23! !B's 1 day's work = 10/299! !(A + B)'s 1 day's work = (1/23 + 10/299) = 23/299 = 1/13! !Therefore, A and B together can complete the work in 13 days..
Question No 50
Some articles were bought at 6 articles for Rs. 5 and sold at 5 articles for Rs. 6. Gain percent is
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Solution!
Suppose, number of articles bought =L.C.M. of 6 and 5!= 30! !C.P. of 30 articles = (5/6) * 30 = Rs. 25! !S.P. of 30 articles = (6/5)*30! = Rs. 36! !Hence, Gain % = (11/25) * 100 = 44%.
Suppose, number of articles bought =L.C.M. of 6 and 5!= 30! !C.P. of 30 articles = (5/6) * 30 = Rs. 25! !S.P. of 30 articles = (6/5)*30! = Rs. 36! !Hence, Gain % = (11/25) * 100 = 44%.
Question No 51
Value of a house decreased from $250000 to $200000. What is the percentage decrease in the value?
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Solution!
Decrease in value of house = 250000 - 200000 = 50000! !Percentage decrease = (50000/250000)*100 = 20%.
Decrease in value of house = 250000 - 200000 = 50000! !Percentage decrease = (50000/250000)*100 = 20%.
Question No 52
A takes twice as much time as B or thrice as much time as C to finish a piece of work.Working together,they can finish the work in 2 days.B can do the work alone in
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Solution!
Suppose A, B and C take x, x/2, x/3 days respectively to finish the work.! !Then,!(1/x + 2/x + 3/x) = 1/2!6/x = 1/2!x=12! !So, B takes (12/2) = 6 days to finish the work..
Suppose A, B and C take x, x/2, x/3 days respectively to finish the work.! !Then,!(1/x + 2/x + 3/x) = 1/2!6/x = 1/2!x=12! !So, B takes (12/2) = 6 days to finish the work..
Question No 53
If 6 men and 8 boys can do a piece of work in 10 days while 26 men and 48 boys can do the same in 2 days, the time taken by 15 men and 20 boys in doing the same type of work will be
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Solution!
Let, 1 man's 1 day's work = x!and 1 boy's 1 day's work = y! !Then, 6x + 8y = 1/10!and 26x + 48y = 1/2! !Solving these two equations, we get!x = 1/100!and y = 1/200! !(15 men + 20 boy)'s 1 day's work = (15/100 + 20/200) = 1/4! !Hence, 15 men and 20 boys can do the work in 4 days..
Let, 1 man's 1 day's work = x!and 1 boy's 1 day's work = y! !Then, 6x + 8y = 1/10!and 26x + 48y = 1/2! !Solving these two equations, we get!x = 1/100!and y = 1/200! !(15 men + 20 boy)'s 1 day's work = (15/100 + 20/200) = 1/4! !Hence, 15 men and 20 boys can do the work in 4 days..
Question No 54
Alfred buys an old scooter for Rs. 4700 and spends Rs. 800 on its repairs. If he sells the scooter for Rs. 5800, his gain percent is
Select the correct answer
Solution!
Cost Price (C.P.) = (4700 + 800) = Rs. 5500! !Selling Price (S.P.) = Rs. 5800! !Gain = (S.P.) - (C.P.) = (5800 - 5500) = Rs. 300! !Gain % = (300/5500) * 100 = 60/5 %.
Cost Price (C.P.) = (4700 + 800) = Rs. 5500! !Selling Price (S.P.) = Rs. 5800! !Gain = (S.P.) - (C.P.) = (5800 - 5500) = Rs. 300! !Gain % = (300/5500) * 100 = 60/5 %.
Question No 55
What will be the selling price of an article that was bought for $475 and sold at a loss of 12%?
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Solution!
12% of 475!=(475*12)/100 = 57! !Selling price = 475-57 = 418.
12% of 475!=(475*12)/100 = 57! !Selling price = 475-57 = 418.
Question No 56
Price of an article increased from $50 to $55. What is the percentage increase?
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Solution!
Increase in price = 55-50 = 5!Percentage increase = (5/50)*100! =10%.
Increase in price = 55-50 = 5!Percentage increase = (5/50)*100! =10%.
Question No 57
Twenty women can do a work in sixteen days. Sixteen men can complete the same work in fifteen days. What is the ratio between the capacity of a man and a woman?
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Solution!
(20 x 16) women can complete the work in 1 day.! !So, woman's 1 day's work = 1/320! !(16 x 15) men can complete the work in 1 day.! !So, 1 man's 1 day's work = 1/240! !So, required ratio = (1/240) / (1/320)!= (1/3) / (1/4) = 4/3.
(20 x 16) women can complete the work in 1 day.! !So, woman's 1 day's work = 1/320! !(16 x 15) men can complete the work in 1 day.! !So, 1 man's 1 day's work = 1/240! !So, required ratio = (1/240) / (1/320)!= (1/3) / (1/4) = 4/3.
Question No 58
100 oranges are bought at the rate of Rs. 350 and sold at the rate of Rs. 48 per dozen.The percentage of profit or loss is
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Solution!
C.P. of 1 orange = 350/100 = Rs. 3.50! !S.P. of 1 orange = 48/12 = Rs. 4! !Hence, Gain% = (0.50)/(3.50) * 100 = 100/7 %.
C.P. of 1 orange = 350/100 = Rs. 3.50! !S.P. of 1 orange = 48/12 = Rs. 4! !Hence, Gain% = (0.50)/(3.50) * 100 = 100/7 %.
Question No 59
When a plot is sold for $18,700, the owner loses 15%.At what price must that plot be sold in order to gain 15%?
Select the correct answer
Solution!
85 / 18700 = 115 / x! !x = (18700 * 115)/85 = 25300! !Hence, S.P. = $25,300.
85 / 18700 = 115 / x! !x = (18700 * 115)/85 = 25300! !Hence, S.P. = $25,300.
Question No 60
A farmer bought a cow for Rs. 14000 and sold it for Rs. 15400. Find his profit percentage.
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Solution!
Profit = 15400 - 14000 = 1400! !Profit percentage = (1400/14000)*100 = 10%.
Profit = 15400 - 14000 = 1400! !Profit percentage = (1400/14000)*100 = 10%.
