[計量]PP1-DS-41.76.93
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.
這題不懂的是第二個選項
如果n=4 factors有1.2.2或是1.4 這樣2-1或4-1 不也是odd的嗎?
Ans: B
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