急！！！下午考！1

zyj1203 · 发表于 2008-9-2 10:27:00

259.
A tire, 40% of its weight is tread. After use, half of the tread is lost. What
is the percentage of weight of remaining tread Vs. weight of remaining
tire?

答案：25%

怎么回事？？？

z

fly_holly · 发表于 2008-9-2 10:43:00

remaining tread=40%*50%=20%

remaing tire=1-20%=80%

VS=20% / 80%=25%

zyj1203 · 发表于 2008-9-2 10:49:00

看错题目了

谢谢MM

急！！！下午考！1

急！！！下午考！1

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