Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Does anyone know the answer? [#permalink]
19 Jul 2007, 13:08

Hi there guys,

This is a tough GMAT question, any hep will be appreciatble

Each employee on a certain task 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 5000 less then the average of all employees on the task force

2. The average (arithmetic mean) salary of the directors on the task force is 15000 greater then the average of all employees on the task force

1. Statement 1 is sufficient
2. Statement 2 is sufficient
3. Both statements are sufficient , but neither alone
4. Each statement is sufficient
5. Statements 1 and 2 are not sufficient

Let's pick numbers. Let's assume manager's avg salary is 10000

(1) This statement tells you that the avg salary of all employee is 15000 according to the number we picked. This statement alone is not sufficient.

(2) Statement 2 is not sufficient for the same reason.

But when you combine the two statement together you can solve for this.
manager's avg salary will be 10000
all employee avg salary will be 15000
director avg salary will be 30000

use knowledge of weighted average
M/(M+D)*(10000) + D/(M+D)*(30000)=15000
10M+30D=15M+15D
15D=5M
D/M=1/3
D/(M+D)=1/4 or 25% of total.