pp-T1-DS147

[Huang Hsin-Yi]

147.
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.

ANS:C

[puja]

147.
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.

ANS:C

這題我也解不出來不知道哪位大大可以幫忙~~~

令all average=x
Manager average= x-5000
Director average= x+15000

我的理解理當是 {(x-5000) +(x+15000)}/2 =all average=x 是不是這各觀念有問題?而且也解不出來~~~><

[小花]

請參考這兒

http://www.formosamba.com/phpBB3/viewtopi ... task+force