The present age ratio of A and B is 4:5. After 5 years, the ratio becomes 5:6. What is A’s present age?

Topic: Averages
Subtopic: Age Problems

A15 years

B20 years

C25 years

D30 years

Explanation

Let ages be 4x and 5x. (4x + 5)/(5x + 5) = 5/6 => 24x + 30 = 25x + 25 => x = 5. A’s present age = 4 * 5 = 20 years.

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