题库搜索>问题求解PS-13061
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?
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暂无雷哥网文字解析
设轮胎总重量为x，则tread重量是40%x，从而损耗掉的tread重量则是50%（40%x）=20%x，所以用过后tread的重量占总重量的比率就是：损耗后tread的重量/损耗后轮胎的总重量，就等于（40% -20%）x/（1-20%）x，结果是25%，选C
willowX
啊啊啊tread去掉了也相当于带走总质量一部分，分母变了
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2022-10-05 21:25:46
601737hijv
忍不住说一句，为什么要老玩文字游戏！！！
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2022-09-19 22:11:23
胡萝贝99
我觉得这种题其实直接举数字要比percentage好算。那我们就是假设tire 重100， 其中tread重40，然后用的过程中tread失去了20，那么tread就剩20，但是因为tread是tire的一部分，所以100也失去了20，那就是20/80=1/4=25%
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2022-03-16 22:59:38
419716gjbb
要分成两个部分 40%tread和 60%非tread
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2022-01-12 10:50:03
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问题求解PS
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