求助戰友!!!!!!!! PP 42+討論

hijenny

42.3744-!-item-!-187;#058&003565

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.

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【答案】C

【思路】問J>M

(1)M>500----------------------------------------------------------------------insufficient

(2) J=2M-400--------------------------------------------------------------------- insufficient

(1)(2)用數字代入 J>M--------------------------------------------------------------- sufficient

我選B因為M根J都不可能為負數
所以J一定大於M
你們覺得呢?

keith139

m=400，相同；m=300，m大于j；m=600，j大于m
insufficient