SOLUTION: Molly is 4 years younger than Heidi. In 3 years, Heidi will be twice as old as Molly. How old are they now?

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Question 294159: Molly is 4 years younger than Heidi. In 3 years, Heidi will be twice as old as Molly. How old are they now?
Answer by Deina(147) About Me  (Show Source):
You can put this solution on YOUR website!
m = h - 4
h + 3 = 2(m + 3)
Substitute (h - 4) for m
+h+%2B+3+=+cross%282%28h+-+4+%2B+3%29%29+=+2h+-+2+

Subtract 3 from each side:
+h+%2B+cross%283+-+3%29+=+2h+-+cross%282+-+3%295+
2h - 5 = h = 5
5 - 4 = 1
m = 1

Heidi is 5
Molly is 1
& bob's your uncle!