You can put this solution on YOUR website! Here's a similar problem:
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5 years ago I was 5 times my son's age, in 8 years time I will be 3 times his age. How old am I today?
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F = Father's age, S = Son's age
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F - 5 = 5*(S - 5) = 5S - 15
F + 8 = 3*(S + 8) = 3S + 24
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F - 5 = 5S - 15
F + 8 = 3S + 24
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Solve for F & S