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.
由1得Mary>500，由2得John=2Mary-400,联合1 2得John>600,Mary>500 答案选C，可是我觉得没法判断一定J>M啊~~？
84. 7517-!-item-!-187;#058&005572
If p is a prime number greater than 2, what is the value of p ?
(1) There are a total of 100 prime numbers between 1 and p + 1.
(2) There are a total of p prime numbers between 1 and 3,912.
不知道怎么下手了~~
57.
During a sale, for each shirt that Mark purchased at the regular price, he also purchased a shirt at half the regular price. 这句的意思是只有一件shirt是half the regular price，其余的都是 regular price吗？
How many shirts did Mark purchase during the sale?
(1) The regular price of each of the shirts that Mark purchased during the sale was $21.50.
(2) The total of the prices for all the shirts that Mark purchased during the sale was $129.00.
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