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Re: Somebody Wanna Help Me With My Homework?? - March 26th 2009, 11:11 PM

I think it would be the ratio of them since they are proportional: mathematically (note I've took the reciprocal of QR/PQ and BC/AB to take out a step) :

Code:
PQ/QR = AB/BC
so that
Code:
PQ = QR*(AB/AC) = 35*(15/25) = 21