有个数学题转不过弯了。。求助大家~~

gracezz · 发表于 2010-5-17 16:00:49

Company S produces two kinds of stereos:basic and deluxe.Of the stereos produced by Company S last month,2/3were basic and the rest were deluxe.If it takes7/5as many hours to produce a deluxe stereo as it does to produce a basic stereo, then the number of hours it took to produce the deluxe stereos last month was what fraction of the total number of hours it took to produce all the stereos?

这是个PS答案是7/17
所以我想和大家确认的是标灰的话的意思是Time : 7/5*B=D是吗？也就是用as后面的B做标准，D是B的7/5；我老是想理解成7/5*B才等于后面的B。。。。。

Time : 7/5*B=D; B/D=5/7

Number:B/D=2/1

mapleaf · 发表于 2010-5-17 16:12:20

对你说的没错

gracezz · 发表于 2010-5-17 16:17:21

好我就死死记住这一点！！！

有个数学题转不过弯了。。求助大家~~

所属分类: GMAT考试

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