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GRE最新练习题第13部分

2006-07-06 22:46

  16. A certain machine drills 30 holes in 8 minutes.

  At that constant rate, how many holes will 4 such

  machines drill in 1  hours?

  (A) 300

  (B) 900

  (C) 960

  (D) 1,200

  (E) 2,560

  17. Tina, Ed, and Lauren agree to share the cost of a

  gift and to make their contributions in proportion

  to their ages. Ed's age is  of Tina's age, and

  Lauren's age is   of Ed's age. If Lauren's share

  of the cost is $ 2.50, what is the cost of the gift?

  (A) $25

  (B) $20

  (C) $15

  (D) $12

  (E) $10

  18. Three solid cubes of lead, each with edges 10

  centimeters long, are melted together in a level,

  rectangular-shaped pan. The base of the pan has inside

  dimensions of 20 centimeters by 30 centimeters, and

  the pan is 15 centimeters deep. If the volume of the

  solid lead is approximately the same as the volume of

  the molted lead, approximately how many centimeters

  deep is the melted lead in the pan?

  (A) 2.5

  (B) 3

  (C) 5

  (D) 7.5

  (E) 9

  19. Which of the following CANNOT be the sum of

  two integers that have a product of 30?

  (A) 31

  (B) 17

  (C) -11

  (D) -13

  (E) -21

  20. In the rectangular coordinate system above, if

  point (a, b), shown, and the two points (4a, b) and

  (2a, 2b), not shown, were connected by straight

  lines, then the area of the resulting triangular region,

  in terms of a and b, would be

  (A)

  (B) ab

  (C)

  (D) 2ab

  (E) 4ab

  Questions 21-22 refer to the following graph.

  The top and bottom of each bar indicate, respectively, the highest and lowest daily number of shirts sold during

  the month. The heavy line across each bar indicates the average (arithmetic mean) number of shirts sold per day

  during the month.

  21. What was the range in the daily number of shirts

  sold during March?

  (A) 20

  (B) 45

  (C) 50

  (D) 60

  (E) 70

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