Staff Selection Commission Quantitative Aptitude — Question 261

Question

The ratio of ages of A and B is 3:4. After 6 years, the ratio will be 4:5. What is A's present age?

1. 18
2. 24
3. 30
4. 36

Correct answer

A — 18

Explanation (English)

Let ages be 3x and 4x. (3x+6)/(4x+6) = 4/5. Solving: x = 6. A's age = 18

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