OG15 PS203求解

芊层酥 · 发表于 2015-8-15 13:12:57

203. 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?
答案是3.

解析里设p是价格， n是数量，列出了两个式子：(p+1)(n-10)=120; pn=120
就想问问pn=120是怎么看出来的……　　

心心- · 发表于 2015-8-15 13:29:42

原来的价格P下120可以买N个，后来。。。

芊层酥 · 发表于 2015-8-15 13:48:41

心心- 发表于 2015-8-15 13:29
原来的价格P下120可以买N个，后来。。。

是从哪句看出来的= = 我好像有点卡住了....只看到变化后120的那句

心心- · 发表于 2015-8-15 14:03:57

If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $120
就是说如果提价1刀，用120刀就只能比以前少买10个，fewer是和之前比，既然有n-10,应该能理解出120刀也含着原价下能买n个。。不好意思表达能力有限= =

芊层酥 · 发表于 2015-8-15 14:36:53

心心- 发表于 2015-8-15 14:03
If the current price of each towel were to be increased by $1, 10 fewer of the towels could be boug ...

这下明白了~~~谢谢~~~

爱吃醋的牙牙 · 发表于 2016-4-24 03:59:55

心心- 发表于 2015-8-15 14:03
If the current price of each towel were to be increased by $1, 10 fewer of the towels could be boug ...

这样说就明白了。。可能是表达差异吧我看题和答案的时候也是完全不明白

OG15 PS203求解

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