11月19日GRE数学机经小范围精准预测

>>GRE考试:11月19日GRE数学机经小范围精准预测

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题目

1. Quantity A: The least prime number greater than 24

Quantity B: The greatest prime number less than 28

A. Quantity A is greater.

B. Quantity B is greater.

C. The two quantities are equal.

D. The relationship cannot be determined from the information given.

参考答案：A

题目解析：prime number = 质数，比24大的质数中最小的是29，比28小的质数中最大的是23，因此选A。

2. Quantity A：54% of 360

Quantity B：150

A. Quantity A is greater.

B. Quantity B is greater.

C. The two quantities are equal.

D. The relationship cannot be determined from the information given.

参考答案：A

题目解析：不用去算54%*360，只要知道360的一半是180，A超过了，所以比B大，因此选A。

3. When the decimal point of a certain positive decimal number is moved six places to the right, the resulting number is 9 times the reciprocal of the original number. What is the original number?

参考答案：如果一个数的小数点右移6位，那么结果将是这个数的倒数的9倍.

设这个数为x，列出等式：1000000x=9/x，解得x=0.003

4. In the xy-plane, a quadrilateral has vertices at (–1, 4), (7, 4), (7, –5), and (–1, –5). What is the perimeter of the quadrilateral?

A. 17

B. 18

C. 19

D. 32

E. 34

参考答案：E

题目解析：笨办法是自己画坐标轴然后计算，但仔细观察四组坐标会发现各有两组的某一个值相同，因此实际构成一个长方形。最后周长为34。

5. Three pumps, P, R, and T, working simultaneously at their respective constant rates, can fill a tank in 5 hours. Pumps P and R, working simultaneously at their respective constant rates, can fill the tank in 7 hours. How many hours will it take pump T, working alone at its constant rate, to fill the tank?

A. 1.7

B. 10

C. 15

D. 17.5

E. 30

正确答案：D

题目解析：根据题目条件，设三个泵各自速率为p,r,t。列出等式：(p+r+t)*5=(p+r)*7，算出p+r=2.5t，然后设T独自工作需要时间为x，列出等式：(p+r)*7=t*x，代入上个式子的结果，x=2.5*7=17.5。

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