SOLUTION: my sister is three years older than i am . the sum of our age is 29. how old am i ?

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Question 719287: my sister is three years older than i am .
the sum of our age is 29.
how old am i ?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
my sister is three years older than i am .
the sum of our age is 29.
how old am i ?
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Equation:
s = i + 3
s + i = 29
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Substitute and solve for "i":
i + 3 + i = 29
2i = 26
i = 13 yrs
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Cheers,
Stan H.