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Before a certain tire is used, 40% of its total weight [#permalink]
11 May 2008, 05:19
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Before a certain tire is used, 40% of its total weight consists of tread. If during a lifetime of use, 50%, 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 remaning tread?