一道prep上的数学，求解！！！

woozi · 发表于 2011-3-29 00:06:54

答案是C，实在是闹不懂啊。请各位n人帮助解答为何联立的就行？多谢！！！

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.

woozi · 发表于 2011-3-29 00:10:15

刚看到下面有人问同样的题，不好意思。。。

czghy · 发表于 2011-3-29 00:32:11

同问

TeamCancer · 发表于 2011-3-29 04:15:59

联立以后四未知数三方程互相独立，可以求出其中两个未知数的比例

一道prep上的数学，求解！！！

所属分类: GMAT考试

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