Problems on Ages · Question 6 · Medium
The present ages of A and B are in the ratio 5 : 7. After 6 years the ratio will be 7 : 9. What is B's present age?
- 18 years
- 21 years
- 24 years
- 28 years
Answer and explanation
Answer: B. 21 years
Explanation: (5k + 6)/(7k + 6) = 7/9 gives 45k + 54 = 49k + 42, so k = 3. B = 7 × 3 = 21 years.
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