最新gre数学难题解析(六)

　　下面为大家总结了最新的gre数学难题。有很多gre考生对gre数学考试十分苦恼，其实最有效的方法就是多练习，把数学基础知识记牢，这样才能在考试中对答如流。而gre数学考试中也会出现一些难题，想拿高分也十分不容易。

　　51.The percent increase from the least monthly car sales shown to the sales in July 1993 was most nearly equal to____

　　A.20% B.35% C.45% D.55% E.65%

　　52. For which symptom are the ratings closest to the arithmetic mean for that symptom, as measured by the standard deviation of its ratings?

　　A.H B.L C.P D.T E.V

　　53. The cost of sending a package special delivery is x cents per ounce up to 10 ounces and y cents for each ounce in excess 10. Which of the following represents the total cost, in cents, of sending special delivery a package weighing w ounces, if w 10?

　　A. x+y+10

　　B. x++y

　　C. 10x+10

　　D.10x+y

　　E. 10x+wy

　　54. The jewels in a certain tiara consist of diamonds, rubies, and emeralds. If the ratio of diamonds to rubies is 5/6 and the ratio of rubies to emeralds is 8/3, what is the least number of jewels that could be in the tiara?

　　A.16 B.22C.40D.53E.67

　　55.Column A: The area of the triangular region.

　　Column B: The area of the circular region.

　　answer: D

　　56.If 3 cars have traveled a total of 180,000 miles and the distance traveled by each car differs by at least 1 mile from the distance traveled by either of the other 2 cars, what is the minimum possible number of mile traveled by the car with most mileage?

　　A.60,001 B.60,002 C.61,000 D.91,000 E.180,000

　　57. According to the graph, which of the following statements must be true?

　　. For each of the years 1986 through 1990, the number of cat licenses issued was greater than that of the previous year.

　　. In Town x more households had dogs in 1986 than in 1985.

　　. For at least one of the years shown, the number of cat licenses issued was more than 3/2 times the number of dog licenses issued.

　　A. only B.only C.omly D.and E.and

　　58. How many 4-digit numbers begin with an odd digit and end with an even digit?

　　A.250 B.500 C.2,000 D.2.500 E.5.000

　　59.answer: A

　　60. In a bowl that contains 20 marbles, 7 are green, 6 are red, and the remainder are blue. Two marbles are to be drawn at random from the bowl without replacement.

　　Column A: The probability that one marble is green and the other marble is red.