Question 940009: Sarah's father is four times as old as mary. Five years ago he was seven times as old. How old is Mary and her father? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Sarah's father is four times as old as mary. Five years ago he was seven times as old. How old is Mary and her father?
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Equations:
f = 4m
f-5 = 7(m-5)
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Substitute and solve for "m"::
4m-5 = 7m-35
3m = 30
m = 10 yrs (Mary's age now)
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f = 4m = 40 yrs (Father's age now)
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Cheers,
Stan H.
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