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