Dan wrote:

Each employee on a certain task force is either a manager or a director. What percent ofthe employees on the task force are directors?

(1) the average (arithematic mean) of the 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 (arithematic mean) of the salary of the directors on the task force is $15,000 greater than the average salary of all employees on the task force

My answer is C,

Obviously both conditions alone are insufficient..

So let us take a situation that combines both condition

Group avg of 10000

M for no of managers (Avg salary of 5000)

D for no of directors (Avg salary of 25000)

Now according to the conditons

(M*5000 + D*25000)/(M+D) = 10000

solving this

D/M = 1/3, so directors are 25% of the group.

If somethings wrong, Pl.let me know

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