The total age of A,B and C is 90 Years.Ten years ago the ratio of their ages was 1:2: What is the present age of B?

A 40

B 30

C 20

D 18

Correct Answer: Option B

Let their ages 10 years ago is x, 2x and 3x years. 10 + 2x + 10 + 3x + 10 = 90 hence x= 10 B’s present age = (2x + 10) =30 years