【GRE考满分题库检索】GRE 题目搜索_数学

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题目内容
ABCD is a rectangle. E and F are the midpoints of sides BC and CD, respectively. Quantity A The area of quadrilateral region AECF Quantity B $$\frac{1}{2}$$ the area of rectangular region ABCD
List P consists of all prime numbers between 30 and 100. List S consists of all odd integers between 30 and 100 that are not prime numbers. Quantity A The range of the numbers in P Quantity B The range of the numbers in S
N is the number of ordered pairs (x, y) such that 4y < 12-3x and each of x and y is a positive integer. Quantity A N Quantity B 3
A={1, 4, 7, 9, 11} B={3, 4, 5, 6, 7, 8, 9} For sets A and B above, which of the following sets is a subset of A but not a subset of B? Indicate all such sets.

A continuous random variable R has a mean of 77 and a standard deviation of 8. What is the value of R that is 2.5 standard deviation above the mean?
A ball is to be selected at random from a bag containing red balls, green balls, and blue balls. The probability of selecting a red ball is equal to x. If the probability of selecting a green ball equals the probability of selecting a blue ball, what is the probability of selecting a green ball, in terms of x ?
A simple sailboat often has two sails, the mainsail and the headsail, as shown in the figure above.A recreational sailor is building a simple sailboat and is designing each sail to be in the shape of a right triangle. The mainsail will have a height of 12 feet and a hypotenuse of length 15 feet.The headsail will have a height of 15 feet and a hypotenuse of length 16.25 feet. Based on the design, the area of the mainsail will be how much greater than the area of the headsail? Give your answer to the nearest square foot.
How many of the airlines shown had more than 500,000 passengers in June 2006?
For Airline D in June 2007, if the average number of passengers per flight was the same for flights that were not on time as it was for all flights, approximately how many passengers were on a flight that was not on time?
Approximately how many passengers did Airline E carry in June 2006?
The interquartile range of 1,000 measurements is 24, and the range of the 1,000 measurements is 50. Each of the measurements is to be revised by multiplying it by 2 and then subtracting 5 from the product. For the revised measurements, what will be the ratio of the interquartile range to the range? Give your answer as a fraction.
If a particle travels at a constant speed of 4 centimeters per second, approximately how many hours will it take for the particle to travel 1 kilometer?
Yesterday an Italian restaurant gave a free drink to the 9th customer and every 9th customer thereafter,.a free salad to the 12th customer and every 12th customer thereafter, and a free slice of pizza to the 15th customer and every 15th customer thereafter. If 2 customers were given both a free drink and a free slice of pizza and if 11 customers were given a free salad, which of the following could be the number of customers at the restaurant yesterday?
The solution set of which of the following inequalities is graphed on the number line above?
A safe contains 2 bags of coins and 4 bags of paper money. The total value of the money in the 6 bags is $1,200. Quantity A The total value of the money in the bags that contain coins Quantity B $401
b=-3 c=6 Quantity A $$\frac{bc}{b+c}$$ Quantity B $$\frac{b+c}{bc}$$
The table shows the frequency distribution of the 57 numbers in a list. Quantity A The average (arithmetic mean) of the 57 numbers Quantity B The median of the 57 numbers
$$\frac{1}{x}$$+$$\frac{1}{y}$$=1 Quantity A x+y Quantity B xy
The operation ⭕️ is defined by a⭕️b=2a+3b for all numbers a and b. x is a positive number. Quantity A (2x) ⭕️(3x) Quantity B (3x) ⭕️(2x)