Question

Twenty years ago, a person's age was one-third his present age. His present age is:
​

Answer 1

Let the present age be x years,

Twenty years ago the age was =(x−20) years

According to the given condition,

x−20=

$\frac{1}{3} \times \: x$

⟹3(x−20)=x[Bycross−multiplication]

⟹3x−60=x

⟹3x−x=60

⟹2x=60

⟹x=30

Hence, the present age is 30 years.

Khadijah21