数学Prep的一道题，看不懂，求解答。

saven · 发表于 2011-4-27 16:12:11

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 (arithmetic mean)salary of the managers on the task force is $5,000 less than the average salary of all employees on the task force.
(2)The average (arithmetic mean)salary of the directors on the task force is $15,000 greater than the average salary of all employees on the task force.

答案是B。不知这道题的突破口在哪里？

saven · 发表于 2011-4-27 16:19:25

不对，答案是C，两者结合。

Avengeryzc · 发表于 2011-4-27 21:14:29

看完提干，这道题目不是选c就是选e。
设平均工资为x
那么 M x-5000 人数为a
D x+15000 人数为b
so a（x-5000）+b（x+15000）=（a+b）x
明显可以得到a与b的关系，因此选c~

saven · 发表于 2011-4-29 09:14:09

晓得了。。谢谢-w-

数学Prep的一道题，看不懂，求解答。

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