SOLUTION: A father is four times as old as his daughter is now. In 20 years, he will be only twice as old as his daughter. How old are the father and daughter now?

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Question 281100: A father is four times as old as his daughter is now. In 20 years, he will be only twice as old as his daughter. How old are the father and daughter now?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
Father Daughter
F=4D
F+20=2(D+20)
F+20=2D+40
F=2D+20
4D=2D+20
2D=20
D=10
F=40