Present ages of A and B are in the ratio $1:2$. If their average age is $24$ years, B is:

Question

Present ages of A and B are in the ratio $1:2$. If their average age is $24$ years, B is:

Option A

24

Option B

28

Option C

30

Option D — Correct answer

32

Correct choice.

Explanation

Let ages be $x$ and $2x$. Then $\frac{x+2x}{2}=24\Rightarrow3x=48\Rightarrow x=16$. So B is $32$.

Chapter Mock 6: Average and Ages