SOLUTION: A boy is 12 years older than his sister. If in 4 years time he will be twice her age, what are their present ages?

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Question 1174970: A boy is 12 years older than his sister. If in 4 years time he will be twice her age, what are their present ages?
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
b and b-12
Boy and sister

b%2B4=2%28b-12%2B4%29
b%2B4=2b-16
4%2B16=b
-
system%28b=20%2Cand%2Cb-12=8%29