Quantitative Aptitude • Ratio, Average & MixtureMedium
The ages of A and B are in the ratio 5 : 6. After 4 years, the ratio of their ages will be 17 : 20. What is A's present age?
A. 30 years✓ Correct Answer
B. 34 years
C. 36 years
D. 6 years
💡 Solution & Explanation
Let the present ages be 5x and 6x. After 4 years: (5x + 4) : (6x + 4) = 17 : 20. Cross-multiplying: 20(5x + 4) = 17(6x + 4), which gives 2x = 12, so x = 6. A's present age is 5 × 6 = 30 years (and B's is 36). Check: after 4 years they are 34 and 40, which is 17 : 20.
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