Answer:
24
Explanation:
42 + x = 2 (9 +x) (solve for x)
42 + x = 18 + 2x
42 -18 = 2x -x
24 = x
42 + 24 = 66
9 + 24 = 33
When the man turns 66, his son will be 33, or half his age.
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