Arithmetic Reasoning - Verbal and Reasoning

Q1:

A father tells his son, "I was of your present age when you were born". If the father is 36 now, how old was the boy five years back ?

A 13

B 15

C 17

D 20

ANS:A - 13

Explanation: Let the father's age be x and the son's age be y. Then, x - y = y or x = 2y, Now, x = 36. So, 2y = 36 or y = 18. Therefore Son's present age = 18 years. So, son's age 5 years ago = 13 years.