SOLUTION: zelma is 18 years older than her son. she was 3 times as old as he was one year ago. how old are they now?
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Question 383248: zelma is 18 years older than her son. she was 3 times as old as he was one year ago. how old are they now? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! zelma is 18 years older than her son. she was 3 times as old as he was one year ago. how old are they now?
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Equations:
z = s + 18
(z-1) = 3(s-1)
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Substitute for "z" and solve for "s":
(s+18-1) = 3(s-1)
(s+17) = 3s-3
2s = 20
s = 10 yrs (Son's age now)
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Since z = s+18, z = 28 (Zelma's age now)
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Cheers,
Stan H.
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