SOLUTION: a father is now four times as old as his son. five years ago he was seven times as old as his son. how old are tehy now?
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Question 612871: a father is now four times as old as his son. five years ago he was seven times as old as his son. how old are tehy now?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a father is now four times as old as his son. five years ago he was seven times as old as his son. how old are they now?
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Equations:
f = 4s
f-5 = 7(s-5)
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Substitute for "f" and solve for "s":
4s - 5 = 7s - 35
3s = 30
s = 10 (Son's age now)
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solve for "f";
f = 4s
f = 40 (Father's age now)
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Cheers,
Stan H.
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