SOLUTION: A father is 45 years old and his son is 9 years old.In how many years time will the father be three times as old as the son?

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Question 803362: A father is 45 years old and his son is 9 years old.In how many years time will the father be three times as old as the son?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x years until father is three times older than his son.
%2845%2Bx%29%2F%289%2Bx%29=3, ratio of their ages is three.
x%2B45=3%28x%2B9%29
x%2B45=3x%2B27
45=2x%2B27
2x=45-27
2x=18
x=9