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标题: For Help !A math question [打印本页]

作者: feierer 时间: 2008-9-16 07:14 标题: For Help !A math question

A store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $120,excluding sales tax.What is the current price of each towel?

What does the underlined part mean ?

作者: SunnyApples 时间: 2008-9-16 20:37

我想应该是这样

原来120块钱能某件东西n个，涨价后，120块钱只能买n-10个了

设原来价格是x,两个方程:

120=nx

120=(n-10)(x+1)

两个解，3和-4，舍去负解，答案是3

作者: feierer 时间: 2008-9-17 07:01

So smart and I think you are right!

I just didn't know the meaning of the sentence! Now I got it. Thanks!

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