20100912-GMAT陈婧-逻辑数学课教材---答案.docVIP

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20100912-GMAT陈婧-逻辑数学课教材---答案.doc

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20100912-GMAT陈婧-逻辑数学课教材---答案

练习将以下信息表达为数学式子 Y A = 2/3 B X = 2B. Jack is now 14 years older than Bill. If in 10 years Jack will be twice as old as Bill, how old will Jack be in 5 years? A. 9 B. 19 C. 21 D. 23 E. 33 1-5.D C. 20% B 18 5. 一样大 6. C 7.D. 8. C 9. A. 10. B 11. 一群鹅，用来做移民（Immigration）试验，30%是公的，在移民的鹅中20%是公的，问：公鹅的迁徙率比母鹅的迁徙率是多少？ 12. 13. 8个 14. B 15. 1X5 -2X, OR X12 16-1. 19 16-2. 33 16-3. 14 17. A 18. B 19. E 20. B 21. Note: The figure is not drawn to scale. A rectangular picture is surrounded by a boarder, as shown in the figure above. Without the boarder the length of the picture is twice its width. If the area of the boarder is 196 square inches, what is the length, in inches, of the picture, excluding the boarder? A. 10 B. 15 C. 30 D. 40 E. 60 22. D 23. B 24. C5,3 * P3,3？ 25. 26. 正向解题：C4,3 + C4,2*C5,1+C4,1*C5,2 逆向思维：C9,3 – C5,3 27. C5,2*C10,2 28． 29. 3/8 30. P4,4 31. 1.一个人扔飞镖，击中靶心的概率是0.7，这个人连续扔了4次飞镖，其中有2次扔中靶心的概率是多少？ 32. . 33.3/8 34.A ； 35. 36. E. 9% 37. Cars X and Y were traveling together on a straight road at a constant speed of 55 miles per hour when car X stopped for 5 minutes. If car Y continued to travel at 55 miles per hour, how many minutes from the time that car X resumed traveling did it take car X traveling at 60 miles per hour to catch up with car Y ? (Assume that the time for car X to slow down and speed up was negligible. A. 5 B. 30 C. 45 D. 55 E. 60 38. If Art and Rita can do a job in 4 hours when working together at their respective constant rates and Art can do the job alone in 6 hours, in how many hours can Rita do the job alone? 39. If A can do a job in 20 days and B can do the job in 30 days, they work together to do this job and in this period, A stop work for 2.5 days and B stop work for x days, and the job be finished for 14 days, what is x? 40. If x(2x+1)=0 and (x+)(2x-3)=0, then x= A. -3 B. - C. 0 D. E.