Staff Selection Commission Quantitative Aptitude — Question 369

Question

The ages of A and B are in ratio 5:7. After 8 years, ratio will be 3:4. Find A's present age

1. 30
2. 35
3. 40
4. 45

Correct answer

C — 40

Explanation (English)

Let ages be 5x and 7x. (5x+8)/(7x+8) = 3/4. Solving: x = 8. A's age = 40

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