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?

Correct Answer: 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.

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