求助OG195

liikkk · 发表于 2011-8-3 17:14:04

195。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, 10fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel?
A. $ 1
B. $ 2
C. $3
D. $ 4
E. $ 12
求解答，我想来想去还没弄懂这题目的意思，正确答案是 C。。

Tobelogical · 发表于 2011-8-3 17:32:44

设价格x，则碗的数量为120/x, 得
(x+1)*(120/x - 10)=120
计算得，
x=3或x=-4

liikkk · 发表于 2011-8-3 17:43:26

If the current price of each towel were to be increased by $1, 10fewer of the towels could be bought for $120
请问这句话应该怎么理解？少了10个毛巾还是一样的总价？

Tobelogical · 发表于 2011-8-3 17:46:21

呃，不是碗啊，8好意思看错了。
意思是说，如果现在的价格增加1块钱，那么以前120元卖出去的碗数就会少10个
比方说，以前120块卖40个碗，涨价只要卖30个就120了。

Tobelogical · 发表于 2011-8-3 17:47:48

这个GMAC太挫了，语法提倡主动优先，数学搞这么多被动。
真是wordy and awkward!!

liikkk · 发表于 2011-8-3 18:02:14

哈哈。确实很WORDY。弄懂了，谢谢~~~

求助OG195

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