1. Each employee on a certain work force is either a manager or a director. What percent of the employees are directors?
(1) The average (arithmetic mean) salary of the managers is $5,000 less than the average salary of all employees (2) The average (arithmetic mean) salary of the directors is $15,000 greater than the average salary of all employees.
I chose E. But the given correct answer is C. 百思不得其解.
2. If n and t are positive integers, what is the greatest prime factor of the product nt?
(1) The greatest common factor of n and t is 5 (2) The least common multiple of n and t is 105.
The given correct answer is B. 这题我是试出来的. 想问问有没有数学证法?
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发表于 2006-11-18 12:45:00
发表于 2006-11-18 15:14:00
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