GMAT 练习题02.doc

Math Section-Q1:A family-size box of cereal contains more cereal and costs more than the regular-size box of cereal. What is the cost per ounce of the family-size box of cereal?(1)The family-size box of cereal contains 10 ounces more than the regular-size box of cereal.(2) The family-size box of cereal costs $5.40.A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.Answer: -Q2:A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster. If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?A. 0B. 1/9C. 2/9D. 1/3E. 1Answer: -Q3:If x and y are positive, is 4x 3y?(1) x y - x(2) x/y k?(1) 2x 2k = 4(2) 9x 3k = 81A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.Answer: -Q6:If x and y are positive, what is the value of x y?(1) (x2 y2) / (x + y) = 4(2) x + y = 7A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.Answer: -Q7:A circular mat with diameter 20 inches is placed on a square tabletop, each of whose sides is 24 inches long. Which of the following is closest to the fraction of the tabletop covered by the mat?A. 5/12B. 2/5C. 1/2D. 3/4E. 5/6Answer: -Q8:In 1997 there were 300 female employees at Company C. If the number of female employees at Company C increased by 60 percent from 1977 to 1987, by what percent did the number of female employees at Company C increase from 1987 to 1997?(1)From 1977 to 1997 the number of female employees increased by 200 percent at Company C.(2) In 1977 there were 100 female employees at Company C.A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.Answer: -Q9:A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?A. 1/12B. 1/6C. 1/5D. 1/3E. 1/2Answer: -Q10:A set of numbers has the property that for any number t in the set, t + 2 is in the set. If 1 is in the set, which of the following must also be in the set? I. -3II. 1III. 5A.I onlyB.II onlyC.I and II onlyD.II and III onlyE.I, II, and IIIAnswer: -Q11:In a corporation, 50 percent of the male employees and 40 percent of the female employees are at least 35 years old. If 42 percent of all the employees are at least 35 years old, what fraction of the employees in the corporation are females?A. 3/5B. 2/3C. 3/4D. 4/5E. 5/6Answer: -Q12:If n is an integer and 2 n 7y?(1) x y + 4(2) -5x 0, then 1/(2x)+x =A. 1/(3x)B. 1/2(2x)C. 1/(x2)D. (2-1)/xE. (1+2)/xAnswer: -Q21:When Leo imported a certain item, he made a 7 percent import tax on the portion of the total value of the item in excess of $1,000. If the amount of the import tax that Leo paid was $87.50, what was the total value of the item?A. $1,600B. $1,850C. $2,250D. $2,400E. $2,750Answer: -Q22:In the sequence 1, 2, 4, 8, 16, 32, , each term after the first is twice the previous term. What is the sum of the 16th, 17th, and 18th terms in the sequence?A. 218B. 3(217)C. 7(216)D. 3(216)E. 7(215)Answer: -Q23:In the xy-plane, point (r, s) lies on a circle with center at the origin. What is the value of r2 + s2?(1) The circle has radius 2.(2) The point (2, -2) lies on the circle.A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.Answer: -Q24:If w and c are integers, is w 0?(1) w + c 50(2) c 48A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.Answer: -Q25:A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row. The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her. How many such arrangements of the 6 people are possible?A. 5B. 6C. 9D. 24E. 36Answer: -Q26:Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?A. 4B. 6C. 8D. 10E. 12Answer: -Q27:If n = 811 8, what is the units digit of n?A. 0B. 1C. 4D. 6E. 8Answer: -Q28:For any positive integer n, the sum of the first n positive integers equals n(n+1)/2. What is the sum of all the even integers between 99 and 301?A. 10,100B. 20,200C. 22,650D. 40,200E. 45,150Answer: -Q29:June 25, 1982, fell on a Friday. On which day of the week did June 25, 1987, fall? (Note: 1984 was a leap year.)A. SundayB. MondayC. TuesdayD. WednesdayE. ThursdayAnswer: -Q30:Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy?(1) She bought $4.40 worth of stamps.(2) She bought an equal number of $0.15 stamps and $0.29 stamps.A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.D. EACH statement ALONE is sufficient.E. Statements (1) and (2) TOGETHER are NOT sufficient.Answer: -Q31:A positive integer n is said to be “prime-saturated” if the product of all the different positive prime f