- A6
- B10
- C12
- D9
Step-by-Step Solution
Let ages be 3k and 5k. (3k + 6)/(5k + 6) = 3/4 gives 12k + 24 = 15k + 18, so k = 2. Younger = 6 years (check: 12 and 16 are in ratio 3 : 4).
Answer: A) 6
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