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by prindaroy » Sun Aug 09, 2009 5:59 pm
For rate problems; A*B/ A+B. This formula usually works for most problems, although I don't personally rely on it all the time. You are bound to come across tricks where that might not work the way its intended to. Anyways;

30*20 / 30 + 20 = 600/50 = 12
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by ST » Sun Aug 09, 2009 6:02 pm
Thank you.
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