问一道GMAT数学题
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?
那个10 fewer of the towels could be bought for $120应该怎样理解?
谢谢~
客户用120刀去买,单价加1刀后就少买10个
设当前价格为p,根据题目可以列出方程:
120 / ( p + 1 ) = 120 / p - 10
求解方程,得到 p = 3
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