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by Anonymous on November 8th, 2009
d = r + 6
now you make the equation relating what happened 6 yrs ago, remembering that then they were r-6 and d-6:
dr = 2(r-6)(d-6)
plug the first eqn into the second one and solve:
r(r+6) = 2(r-6)(r)
you can cancel an r, since r isn't 0!
r+6 = 2(r-6)
r=18
So Ricardo is 18 and his sis is 24.
+5 for your question
MAth homework help in description below
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