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 if he is half the age of his father now?

A) 13 years

B) 15 years

C) 17 years

D) None of these

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