SOLUTION: A father is four times as old as his daughter. In 7 years, he will be three times as old as she is. How old is the daughter now?

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Question 514394: A father is four times as old as his daughter. In 7 years, he will be three times as old as she is. How old is the daughter now?
Answer by richwmiller(9135) About Me  (Show Source):
You can put this solution on YOUR website!
f=4d
f+7=3*(d+7)
4d+7=3d+21
d=14
f=4*14=56
check
56+7=3*(14+7)
63=3*21
63=63
ok