Quantitative Aptitude • Ratio, Average & MixtureMedium
The ages of A and B are in the ratio 3 : 4. After 12 years, the ratio of their ages will be 33 : 40. What is A's present age?
A. 33 years
B. 7 years
C. 28 years
D. 21 years✓ Correct Answer
💡 Solution & Explanation
Let the present ages be 3x and 4x. After 12 years: (3x + 12) : (4x + 12) = 33 : 40. Cross-multiplying: 40(3x + 12) = 33(4x + 12), which gives 12x = 84, so x = 7. A's present age is 3 × 7 = 21 years (and B's is 28). Check: after 12 years they are 33 and 40, which is 33 : 40.
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