Question

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 1

The correct option is A $13$

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.