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心晴 · 发表于 2004-7-17 19:03:00

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?

麻烦哪位NN帮我翻译题目，我怎么看不出来，哪一句的意思是改变前后的乘积都是120啊？

horsefish · 发表于 2004-7-17 23:24:00

一个商店现在的所有毛巾是同样的价格. 如果现在的价格每条增加了(increased by )1$, 买比原来少10条的毛巾花掉120$, 不包括税. 问毛巾现在的价格.(updated)

[此贴子已经被作者于2004-7-18 3:16:12编辑过]

blackhorse · 发表于 2004-7-18 00:06:00

120/X=120/(1+X) + 10

得X＝3

番茄笑了 · 发表于 2005-7-18 06:58:00

以下是引用心晴在2004-7-17 19:03:00的发言：

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?

麻烦哪位NN帮我翻译题目，我怎么看不出来，哪一句的意思是改变前后的乘积都是120啊？

同问啊！这里只是说价格增加了$1和卖少了10条毛巾以后，的收入是$120。可是根本没有表示改变之前和之后是一样的啊？改变后收入和原来不一样也是很有可能的阿~~为什么我们就可以ASSUME这里是一样的呢？

番茄笑了 · 发表于 2005-7-19 08:29:00

我顶！

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