GWD题，急求，在线等！

sierrapan · 发表于 2009-11-21 10:28:16

Before a certain tire is used, 40 percent of its total weight consists of tread. If during a lifetime of use, 50 percent, by weight, of the tire's tread is lost and no other parts of the tire is lost, what per cent of the tire's total remaining weight consists of the remaining tread?

sierrapan · 发表于 2009-11-21 10:57:39

谢谢！

wuwei_carol · 发表于 2009-11-21 10:54:04

40%*(1-50%)/(1-40%*50%)

sierrapan · 发表于 2009-11-21 10:29:03

答案25%

GWD题，急求，在线等！

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