PREP DS1 86

weirui5621 · 发表于 2010-5-2 23:27:58

86.7767-!-item-!-187;#058&005660

答案：E

Each of the students in a certain class received a single grade of P, F, or I.What percent of the students in the class were females?

(1)Of those who received a P, 40 percent were females.

(2)Of those who received either an F or I, 80 percent were males.

请教下，这一题应该怎么想呢？

wxq19881113 · 发表于 2010-5-3 09:36:39

这个题第一个条件没告诉你有多少percent的人received 了P，所以当然无从知晓female的人数。
第二个条件同样没告诉你有多少percent的人received了F,或者I，当然不能知道males的人数。。。
总之这两个条件给的一点联系都没有。。所以就算结合了也算不出答案

weirui5621 · 发表于 2010-5-3 10:46:31

原来是这样啊，没有办法知道P:F:I就推不出来啦，有道理

PREP DS1 86

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