1. a store currently charges the same price for each towel that it sells. if the curent price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $120,（这句话没明白什么意思）excluding sales tax. what is he current price of the towels.
2. s was twice as old as h is. 我觉得翻译成s=2h,但是答案是h=2s.
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发表于 2009-12-17 19:27:41
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