SOLUTION: A man's age is 42 years and his son's age is 12 years. After how many years will the man be thrice as old as his son?

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Question 995611: A man's age is 42 years and his son's age is 12 years. After how many years will the man be thrice as old as his son?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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42 + x = 3*(12+x).

42 + x = 36 + 3x,

2x = 42 - 36

2x = 6,

x = 6%2F2 = 3.

Answer. After 3 years.