Practice | Hashtable

Home > Practice > Arithmetic Aptitude > Problem on Ages > Miscellaneous

1. The present age of son is half of the present age of his mother. Ten years ago, his mother's age was thrice the age of her son. What is the present age of the son ?

A. 20 years

B. 25 years

C. 30 years

D. 40 years

Solution:

Let mother's age be 2x years,
Then, son's age = x years

\begin{aligned} ∴ (2 x - 10) = 3 (x - 10) \\ \Rightarrow 2 x - 10 = 3 x - 30 \\ \Rightarrow x = 20 \end{aligned}

Son's age = 20 years

You must login to add comments. Login now.