A father said to his son, 'I was as old as you are at the present at the time of your birth'. If the father's age is 48 years now, the son's age three years back was-

Question: A father said to his son, 'I was as old as you are at the present at the time of your birth'. If the father's age is 48 years now, the son's age three years back was-

Solution:
let, at present son is x years old
so, at time of his birth the father was x years old

∴ at present the age of father is = x + x year
= 2x year

2x = 48
⇒ x = 48/2
= 24 year

∴ the son's age five years back was = 24 - 3
= 21 years