谢谢! 但是XY的数学题里面没有对应的GWD题号,我有几道题实在是不明白,搜索也找不到,比如下面这题: Is the number of members of Club X greater than the number of members of Club Y ? (1) Of the members of Club X, 20 percent are also members of Club Y. (2) Of the members of Club Y, 30 percent are also members of Club X. 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. 答案是C,但我认为是E。 假设: X=100,Y=110,则20 percent of X 是20 < Y,30 percent of Y 是33 < X; 同样的,假设: X=110,Y=100,则20 percent of X 是22 < Y,30 percent of Y 是30< X; 应该是不能判断的,为什么选C? 那位能够指点一下,谢谢! |