SOLUTION: i am older than my sister, 15 years ago i was 3 times my sister age, 10 years ago i was 2 times my sister age 15 years ago. what is my age now?

Question 952233: i am older than my sister, 15 years ago i was 3 times my sister age, 10 years ago i was 2 times my sister age 15 years ago.
what is my age now?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
i am older than my sister, 15 years ago i was 3 times my sister age, 10 years ago i was 2 times my sister age 15 years ago.
what is my age now?
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Equations:
b-15 = 3(s-15)
b-10 = 2(s-10)
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Modify;:
b - 3s = -30
b - 2s = -10
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Subtract ans solve for "s"::
s = 20 (sister's age now)
----
Solve for "b":
b - 3s = -30
b - 60 = -30
b = 30 (brother's age now)
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Cheers,
Stan H.
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