Question 290615
 George is 5 times as old as his son. In 15 years he will be only twice as old as his son. How old will his son be in 15 years?
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Equations:
g = 5s
(g+15) = 2(s+15)
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Substitute for "g" and solve for "s":
5s+15 = 2s + 30
3s = 15
s = 5 (son's age NOW)
s+15 = 20 (san's age in 15 years)
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Cheers,
Stan H.