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GMAT数学测试基础题+Plus满分思维试水5题

Is x k?(1) 2x o 2k = 4(2) 9x o 3k = 81

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.

In a corporation, 50 percent of the male employees and 40 percent of the female employees are at least 35 years old. If 42 percent of all the employees are at least 35 years old, what fraction of the employees in the corporation are females?

3/5

2/3

3/4

4/5

5/6

Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?

【Plus题】If 2^x+ 2^y = x² + y², where x and y are nonnegative integers, what is the greatest possible value of |x-y|?

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