The ratio of the ages of two persons A and B is 3:4. Six years ago, the ratio was 2:3. What is B’s present age?

Topic: Averages
Subtopic: Age Problems

A18 years

B20 years

C24 years

D30 years

Explanation

Let present ages be 3x and 4x. (3x – 6) / (4x – 6) = 2 / 3 => 3(3x – 6) = 2(4x – 6) => 9x – 18 = 8x – 12 => x = 6. B’s age = 4 * 6 = 24 years.

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