Question

32. 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 5 years back? (a) 13 (b) 15 (c) 17 (d) 20​

Answer 1

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.