题库 | 考满分，百万出国党的口碑之选。

序号	题目内容
81	If each term in the sum $${a}_{1}$$ + $${a}_{2}$$ + . . . + $${a}_{n}$$ is either 7 or 77 and the sum equals 350,which of the following could be equal to n ?
82	An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period?
83	The table above shows the distribution of test scores for a group of management trainees.Which score interval contains the median of the 73 scores?
84	If a quality control check is made by inspecting a sample of 2 lightbulbs from a box of 12 lightbulbs, how many different samples can be chosen?
85	At the end of the first quarter, the share price of a certain mutual fund was 20 percent higher than it was at the beginning of the year. At the end of the second quarter, the share price was 50 percent higher than it was at the beginning of the year. What was the percent increase in the share price from the end of the first quarter to the end of the second quarter?
86	Which of the following is equal to $${x}^{18}$$ for all positive values of x ?
87	In the addition table shown above, what is the value of m + n ?
88	At a certain college there are twice as many English majors as history majors and three times as many English majors as mathematics majors. What is the ratio of the number of history majors to the number of mathematics majors?
89	A company has two types of machines, type R and type S. Operating at a constant rate,a machine of type R does a certain job in 36 hours and a machine of type S does the same job in 18 hours. If the company used the same number of each type of machine to do the job in 2 hours, how many machines of type R were used?
90	A circular jogging track forms the edge of a circular lake that has a diameter of 2 miles.Johanna walked once around the track at the average rate of 3 miles per hour. If t represents the number of hours it took Johanna to walk completely around the lake, which of the following is a correct statement?
91	In the rectangular coordinate system above, the area of △PQR is what fraction of the area of △LMN ?
92	In the rectangular coordinate system above, for which of the shaded regions is the area 2 ?
93	In the figure above, a square is inscribed in a circle. If the area of the square region is 16,what is the area of the circular region?
94	A company plans to assign identification numbers to its employees. Each number is to consist of four different digits from 0 to 9, inclusive, except that the first digit cannot be 0.How many different identification numbers are possible?
95	Which of the following statements can be inferred from the data above?I. the Klein family’s annual income more than doubled from 1985 to 1995II. the Klein family’s annual income increased by a greater amount from 1985 to 1990 than from 1990 to 1995III. the Klein family’s average (arithmetic mean) annual income for the period shown was greater than $40,000.
96	According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
97	If $$\frac{x}{y}=\frac{2}{3}, then \frac{(x-y)}{x}=$$
98	If x is a negative integer, which of the following expressions has the LEAST value?
99	I. 72, 73, 74, 75, 76II. 74, 74, 74, 74, 74III. 62, 74, 74, 74, 89The data sets I, II, and III above are ordered from greatest standard deviation to least standard deviation in which of the following?
100	At a constant rate of flow, it takes 20 minutes to fill a swimming pool if a large hose is used and 30 minutes if a small hose is used. At these constant rates, how many minutes will it take to fill the pool when both hoses are used simultaneously?

序号

题目内容

If each term in the sum $${a}_{1}$$ + $${a}_{2}$$ + . . . + $${a}_{n}$$ is either 7 or 77 and the sum equals 350,which of the following could be equal to n ?

An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period?