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Each employee on a certain task force is either a manager or a director. What percent of the employees of 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


http://www.urch.com/forums/gmat-data...gmat-prep.html (GMAT Prep)
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SK please understand...!
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