SOLUTION: A man is four times as old as his son. Three years ago, he was 5 times s old as his son was at that time. HOW OLD IS THE SON?

Question 785457: A man is four times as old as his son. Three years ago, he was 5 times s old as his son was at that time. HOW OLD IS THE SON?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A man is four times as old as his son. Three years ago, he was 5 times s old as his son was at that time. HOW OLD IS THE SON?
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Equations:
f = 2s
f-3 = 5(s-3)
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Substitute for "f" and solve for "s":
2s-3 = 5s-15
3s = 12
s = 4 yrs (the son's age now)
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Cheers,
Stan H.
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