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Q2: If every car sold last week at a certain used-car dealership was either a coupe or a sedan, what was the average (arithmetic mean) sale price for all the cars that were sold at the dealership last week? (1) The average sale price for the sedans that were sold at the dealership last week was $10,600. (2) The average sale price for the coupes that were sold at the dealership last week was $8,400. A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. D. EACH statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient. the answer is E , however, is it right if we sum two average prices up then divide it by 2 ??
Q6: If a, b, k, and m are positive integers, is ak
a factor of bm? (1) a is a factor of b. (2) k ≤ m A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. D. EACH statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient. answer is C, anybody could prove it? Q10: If each of the students in a certain mathematics class is either a junior or a senior, how many students are in the class? (1) If one student is to be chosen at random from the class to attend a conference, the probability that the student chosen will be a senior is 4/7. (2) There are 5 more seniors in the class than juniors. A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. D. EACH statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient. answer is C. | 
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发表于 2006-7-27 10:09:00
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