x is increased by a factor of 2 = x becomes 2x y is increased by a factor of 3 = y becomes 3y
umm...I think that you have a typo in your question. "What's the value of (x+y)/x when z is 12" should be "What's the value of (x+y)/z when z is 12" Otherwise, the answer is too obvious.
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发表于 2008-4-18 20:21:00
楼主