机经一篇（2。18）

linda

　
——转自GR


1.If Z=2, (2xz+yz)/(2xz-xy)=?
1)2x+y=3
2)Z=2
Ans:E

2.If m,n are nonzero integers, is m^n an integer?
1)n^m is positive
2)n^m is a integer
Ans:A

3.Among a batch of cars, a 74% of them have A, and a 71% of them have B. What is the percent of the cars that have both?
1)the percent of the cars that have B but not A is 11%
2)the percent of the cars that have both is twice the percent that have neither A nor B
Ans

4. I can't remember this item clearly. The sucessor supplement.

A payment on a credit card acount is x or 5 percent of the y, the balance of the credit card account. What is the x?(I'm sure about the question and I must be wrong at this item. But I'm sure about the two conditions.)
1) 10x=y
2) y=200

4. Machines T and S process 1,000 pieces in 4 hours. How many hours will S take to do it alone? The second condition is that T takes ***. I can't remember this condition.But pay attention to it. May be I have made a mistake in understanding the second condition.

CR.An analyst said that a manufacture will lay off its employees. Yet the manufacture has received a big order from another company. Why does analyst not revise his conclusion?

I chose that the company that put the big order has cancelled another bigh order at the same time.