求问prep数学条件充分性判断一题

Fionawang2012 · 发表于 2012-8-12 21:36:30

Each employee on a certain task force is either a manager or a director. What percent of the employees on the task force are directors?
(1) The average salary of the managers on the task force is $5000 less than the average salary of all employees on the task force.
(2) The average salary of the directors on the task force is $15,000 greater than the average salary of all employees on the task force.

这神马思路啊？先谢过各位NN~

emicywwq · 发表于 2012-8-12 21:39:53

C么？？

Fionawang2012 · 发表于 2012-8-12 21:51:16

为啥啊为啥，我就没明白平均工资和百分比有神马关系。。

hshbaby · 发表于 2012-8-12 22:45:15

平均工资包含了人数所以是跟人数的百分比有关的。。

Fionawang2012 · 发表于 2012-8-13 10:47:40

多谢。。纯文科数学白痴飘过。。

求问prep数学条件充分性判断一题

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