SOLUTION: A man 42 years old has a son who is 12 years old. In how many years will the father be as twice as old as his son?

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Question 940379: A man 42 years old has a son who is 12 years old. In how many years will the father be as twice as old as his son?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +n+ = number of years from now
when father is twice as old as son
----------------
+42+%2B+n+=+2%2A%28+12+%2B+n+%29+
+42+%2B+n+=+24+%2B+2n+
+n+=+42+-+24+
+n+=+18+
In 18 yrs, father is twice as old as son
check:
+42+%2B+18+=+60+
+12+%2B+18+=+30+
OK