SOLUTION: in 3 years David will be 3 times as old as his sister martha. A year ago David was 7 times as old as Martha. How old are they now?

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Question 1103257: in 3 years David will be 3 times as old as his sister martha. A year ago David was 7 times as old as Martha. How old are they now?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
d and m, david and martha

system%28d%2B3=3%28m%2B3%29%2Cd-1=7%28m-1%29%29
Simplify and solve for d and m.