Question

Fifteen years later, a man will be two times as old as he was 15 years ago . How old is he now?

Answer 1

Let us assume, the present age of man is x years.

Therefore, 15 years later, the age of the man is = x + 15
and 15 years ago, the age of the man is = x - 15

Given:

x + 15 = 2 ( x - 15)
x + 15 = 2x - 30
x = 45 

Answer - The present age of the man is 45 years