SOLUTION: A girl is 12 years older than sister. If in 4 years time she will be twice her age, what are their ages now?

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Question 981865: A girl is 12 years older than sister. If in 4 years time she will be twice her age, what are their ages now?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
g, girl
s, sister
"She", who?
system%28g=s%2B12%2Cg%2B4=2%28s%2B4%29%29

Do the simple substitution and solve...
and you should find system%28s=8%2Cg=20%29.