SOLUTION: i'm older than my sister. 15 years ago her age was 1/3 of what my age is now. 10 years ago my age was twice what her age was 15 years ago. what is my age today?
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Question 1100859: i'm older than my sister. 15 years ago her age was 1/3 of what my age is now. 10 years ago my age was twice what her age was 15 years ago. what is my age today?
Found 2 solutions by stanbon, josgarithmetic:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
i'm older than my sister. 15 years ago her age was 1/3 of what my age is now. 10 years ago my age was twice what her age was 15 years ago. what is my age today?
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Equations::
s-15 = (1/3)m
m-10 = 2(s-15)
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Rearrange::
3s - 45 = m
2s - 30 = m-10
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s - 15 = 10
s = 25 yrs (Sister's age now)
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m = 3s-45 = 30 (my age today)
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Cheers,
Stan H.
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
y, "my" age
x, sister's age
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