Which one of the following is a prime number ?

551 > 22

All prime numbers less than 24 are : 2, 3, 5, 7, 11, 13, 17, 19, 23.

119 is divisible by 7; 187 is divisible by 11; 247 is divisible by 13 and 551 is divisible by 19.

So, none of the given numbers is prime.

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The average of 5 consecutive even numbers is 34. What is the difference between the highest and lowest number.

Let's 5 consecutive even numbers are:

2, 4, 6, 8, 10.

Lowest term is 2 and highest is 10

10 - 2 = 8

So, difference of 8 will remain the same in the consecutive series numbers.

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There are two trains move towards Each Other 50 km per hour and 60 km per hour respectively. When they meet it is noted that faster train cover 50 km more than the other. Find the total distance travelled by them?

First train cover 10 kilometre more in every hour so for 50 km it has to run in 5 hour.

D=(50+60)*5=550km

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A, B, C, D, E, F and G are members of a family consisting of 4 adults and 3 children, 2 of whome, F and G are girls . A and D are brothers and A is a doctor. E is an engineer married to one of the brothers and has two children. B is married to D and G is there child. Who is C ?

E is married to A or D. But B is married to D. Thus, E is married to A. Thus, A, B, D, E are the 4 adults and C, F, G are the three children in the family. B and D have a child G. A and E have two children. They are C and F. Now, only F and G are girls. So, C is a boy. Thus, C is A's or E's son..

20 women can do a work in 15 days and 15 men can complete a work in 12 days. What is the ratio between the capacity of men and women?

(20*15) women can do a work in 1 day.

So women 1 day =1/300

(15*12) men can do a work in 1 day

So men 1 day work=1/180

So, required ratio=(1/300)/(1/180)

=(1/5)/(1/3)

=3/5

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A family consists of 6 member P, Q, R, X, Y and Z . Q is a son of R but R is not mother of Q. P and R a married couple. Y is the brother of R. X is a daughter of P. Z is a brother of P. Who is the brother in law of P?

Q is son of R but R is not a mother. So, R is the father of Q. P is married to R. So, P is the wife of R and the mother of Q . X is a daughter of P and hence, of R and so she is a sister of Q. Y is a brother of R and Z is a brother of P. R is husband of P and Z brother of P.

R is the husband of P and Z is a brother of P. R is husband of P and Y is brother of R so, Y is brother in law of P.

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In following question, A number series is given with one term missing. Choose the correct alternative

2 , 5 , 9 , 19 , 37 , x

2 , 5 , 9 , 19 , 37 , x

The second number is one more than twice the first;

third number is one twice second;

fourth number is one more then twice the third;

fifth number is one less then twice the fourth.

Thus the sixth number is one more than twice the fifth..

In following number series, either one term is missing or is incorrect.

Choose correct answer from options 1, 5, 14, 30, 55, 93

Choose correct answer from options 1, 5, 14, 30, 55, 93

The correct sequence is + 4, + 9, + 16, + 25, + 36 i.e. + 2

So, 93 is wrong and should be replaced by (55 + 36) i.e. 91..

In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

cab _ a _ c _ bc _ bc _ b _ ab

The series is cab / cab / cab / cab / cab. Thus, the pattern cab is repeated.

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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.

?, siy, oeu, kaq, qwm, cri

The letters in each term are moved four steps backward to obtain the corresponding letters of the next term..