哪位亲能看懂这道GMAT OG的 我实在不知题目所云云.
问题描述：
哪位亲能看懂这道GMAT OG的 我实在不知题目所云云.
On a recent trip,Cindy drove her car 290 miles,rounded to the nearest 10 miles,and used 12 gallons of gasoline,rounded to the nearest gallon.The actual number of miles per gallon that Cindy's car got on this trip must have been between (A)290/12.5 and 290/11.5 (B)295/12 and 285/11.5 (C)285/12 and 285/11.5 (D)285/12.5 and 295/11.5 (E)295/12.5 and 285/11.5 运算应该很简单,请解释一下题目的background knowledge
答
在一次旅行中,欣蒂的车开了290英里,误差10英里(也就是285~295英里)用了12加仑的油,误差1加仑(同理,11.12.5加仑).那么,欣蒂的车每英里耗油在多少范围内?算法不用我说了吧!