<PRE><B>Question 388958</B>
There are two brothers and two sisters. in 10 years they will total 100 in their ages. How much will the total be in 7 years?
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Let their ages now be b,B and s,S
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Equations:
In 10 years:
b+10 + B+10 + s+10 + S+10 = 100
b+B+s+S = 60
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In 7 years:
b+7+B+7+s+7+S+7 = ?
(b+B+s+S)+28 = ?
60+28 = ?
? = 88
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88 is correct
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Cheers,
Stan H. 
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