A) 11 years
B) 9 years
C) 12 years
D) 10 years
Answer: D
Explanation: Let son be x and father 3x; after t years solve 3x + t = 2(x + t).
3x + 10 = 2(x + 10), hence x = 10 years.
A) 11 years
B) 9 years
C) 12 years
D) 10 years
Answer: D
Explanation: Let son be x and father 3x; after t years solve 3x + t = 2(x + t).
3x + 10 = 2(x + 10), hence x = 10 years.
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