GMAT数学题求解~~

问题描述:

GMAT数学题求解~~
A store currently charges the same price for each
towel that it sells. Ifthe 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?
(A) $1
(B) $2
(0 $3
(D) $4
(E) $12
有些看不懂 求各位大神帮帮忙~~
1个回答 分类:英语 2014-10-13

问题解答:

我来补答
用120块钱去买东西,单价加1块钱后就少买10个
设当前价格为p,根据题目可以列出方程:

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

求解方程,得到 x = 3
 
 
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