急问一个数学题。

liuxiqiao · 发表于 2009-8-2 22:13:00

题目：a store currently charges the same price for each touwel that it sells. if the current price of each towel were to be increased by $1, 10fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel? 答案是$3。标红字的部分怎么理解呢?

谢谢啦~！

lyla7 · 发表于 2009-8-2 23:51:00

这题不难的，那句话的意思是当每个毛巾价格涨一块钱的时候，120元就比以前少买10个毛巾，如120可以买t个毛巾，那涨价后120就只能买t-10个了

列式就是设原来的价格是x，120/x=120/(x+1)+10

解出来就可以了~

急问一个数学题。

急问一个数学题。

所属分类: GMAT考试

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