The present age of lewis and Brown are in ratio 1:2. Three years from now, the ages will in ratio 3:5. Find the age of lewis after five years?

Let's present age

Lewis =l

Brown=b

l/b=1:2

l-2b=0

After three years

l+3/b+3=3:5

5l-3b=6

l=6

b=12

After 5 years

l=11

b=17

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Peter introduces David as the son of the only brother of his father's wife.

How is Peter related to David?

The relation may be analyed as follows:

Father's wife........ Mother

Mother's brother.....Uncle

Uncle's son ........ Cousin

So, David is Peter's uncle.

So option no. 1 is correct.

If a boat travels at a speed of 20 km per hour in stillwater. Now if it's travelling in downstream speed of 10 km per hour and travel 70 kilometre. What is the time taken by it?

Time= distance /speed

Sister boat is travelling in a downstream the speed of the stream adds up in the speed of boat so its speed=boat speed+downstream speed. which becomes 20+10=30 km/hr. Now applying the formula we get

Time=70/30 we get our answer which is 2.3

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In following questions, one term in number series is incorrect.

Find out the incorrect number

11, 2, 21, 3, 32, 4, 41, 5, 51, 6

Find out the incorrect number

11, 2, 21, 3, 32, 4, 41, 5, 51, 6

The given sequence is a combination of two series:

I. 11, 21, 32, 41, 51 and

II. 2, 3, 4, 5, 6.

Clearly, the pattern in I is + 10.

So, 32 is wrong and should be replaced by (21 + 10) i.e. 31.

Sherry's math test had 100 problems, 40 arithmetic, 30 algebra, 30 geometry problems. Although he answered 30% of arithmetic, 40% of algebra and 70% of geometry problems correctly, still he got less then 50% marks. How many more questions he would have to answer more to get passed.

Arithmetic: 30% of 40 = 12

Algebra : 40% of 30 = 12

Geometry : 70% of 30=21

Total correct = 12+12+21=45

50-40=5 marks needed to pass.

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In following questions, a sequence of groups of alphabets and numbers is provided with one term missing , Choose the missing term from options. AB, DEF, HIJK, ?, STUVWX

The number of letters in the terms goes on increasing by 1 at each step. Each term consists of letters in alphabetical order. The last letter of each term and the first letter of the next term are alternate..