Each employee on a certain task force is either a manager or a director.What percentage of the employee on the task force are directors?
(1)The average salary of the managers on the task force is $5,000 less than the average salary of all employee 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 employee on the task force.
答案是C,不明白..我觉得算不出来啊
On a certain sight-seeing tour,the ratio of the number of women to the number of children was 5 to 2.What was the number of men on the sight-seeing tour?
(1)On the sight-seeing tour,the ratio of the number of children to the number of men was 5 to 11.
(2)The number of women on the sight-seeing tour was less than 30.
答案C,(2)并没有给出WOMEN数啊..怎么得出MEN数的?
1,设M,D分别有x,y人,求X/Y,设平均A
(A-5000)x+(A+15000)y=A(x+y) à15000y=5000x
W : C=5:2
1) C:M=5:11
2)W 少于30,为5倍数
设为25,C为10,M为22 一组
设为20,C为8,M为88/5
设为15,C为6,M为66/5
设为10,C为4,M为44/5
设为5,C为2,M为11/10
如此只有第一组满足。
谢谢!!!
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