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题库 / Prep2007E1-DS-42
John and Mary own shares of stock in a certain company. Does John own more shares of the company's stock than Mary?
(1) Mary owns more than 500 shares of the company's stock.
(2) The number of shares of the company's stock that John owns is 400 less than twice the number of shares of the company's stock that Mary owns.
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.
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J,M都拥有一个公司的股票，问J有的股票大于M？J-M>0?
条件1：M>500 不知道J的情况，insufficient
条件2：2M-400=J 不知道 JM insufficient
条件1+条件2： 2M-400=J 两遍同减去M(同时减去m，）
m-400=j-m M>500 J-M= M-400>100 J>M SUFFICIENT
选C
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