SOLUTION: Fe is 3 years older than his sister Mary. In 7 years she will be six-sevenths of his age. How old are they?

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Question 668734: Fe is 3 years older than his sister Mary. In 7 years she will be six-sevenths of his age. How old are they?
Answer by swincher4391(1107) About Me  (Show Source):
You can put this solution on YOUR website!
f: Fe
m: Mary
f = m +3

6/7(f+7) = m+7
6/7(m+10) = m + 7
6/7m + 60/7 = m + 7
11/7 = 1/7m
m = 11
f = 14