41.Machines X and Y work at theier respective constant rates. How many more hours does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X, working alone? (1)Machine X and Y, working together, fill a production order of this size in two-thirds the time that machine X, working alone, does. (2)Machine Y, working alone, fills a production order of this size in twice the time that machine X, working alone, does. Ans:E 76.Is the integer K divisible by 4? (1) 8K is disvisible by 16. (2) 9k is disvisible by 12. Ans:B 93.If the integer n is greater than 1, is n equal to 2? (1) n has exactly two positive factors. (2) The difference of any two distant factors of n is odd. 这题不懂的是第二个选项 如果n=4 factors有1.2.2或是1.4 这样2-1或4-1 不也是odd的吗? Ans: B 谢谢大家罗!! --

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