Question 562614: Right now seth's age is 4/5 the age of his brother Eric. 21 years ago eric was twice as old as seth. what are their ages now? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Right now seth's age is 4/5 the age of his brother Eric. 21 years ago eric was twice as old as seth. what are their ages now?
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Equations:
s = (4/5)e
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e-21 = 2(s-21)
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e = (5/4)s
e = 2s-21
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Equation:
(5/4)s = 2s-21
5s = 8s - 84
3s = 84
s = 28 years (Seth's age)
e = (4/5)e = (4/5)28 = 112/5 = 22.4 years (Eric's age)
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Cheers,
Stan H.
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