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标题: 求救一道数学题 [打印本页]

作者: teddyabc 时间: 2011-2-28 07:00 标题: 求救一道数学题

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%  were females

(2)  of those who received an F or I, 80% were males.

答案是E
问题：
为什么答案不是C？两条件结合求不出吗？？

作者: sjmdlycs 时间: 2011-2-28 20:35

0.4x+0.8(y+z)这个整体除以（x+y+z）

我这也是问版上的同学的
自己当时也错了

作者: wahabirds 时间: 2011-3-1 20:08

噢~~~你的XYZ就是P F I 吧？？

应该是这样列式吧？？0.4P+0.2(F+I)/(P+F+I) ????

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