数学充分11-15.docVIP

Section 11 30 Minutes 25 Questions 1. Kellys raise increased his salary by what percent ? (1) Kellys raise was $1,200. (2) Kellys raise increased his taxes to $1,700. 2. Mouse population X doubles every week. How many weeks from now will population X first exceed 1,000,000 ? (1) The mouse population is now 65,536. (2) Fifteen weeks ago the mouse population was 2. 3. If no student took test T more than once, how many students took test T ? (1) The average (arithmetic mean) of the students scores on test T was 72. (2) The sum of he students scores on test T was 2,232. 4. if △ denotes an operation, what is the value of (a△b) △c ? (1) a △ b = 5 (2) 5 △ c = 3 5. If x + 2y = 6, what is the value of x ? (1) 2x + y = 9 (2) 3x + 2y = 14 6. Is (1) x 5.5 (2) x 7 7. Last year of the applicants for a job on a police force passed the physical xamination. If of the applicants who passed the physical examination also passed the written examination, how many of the applicants passed both examinations ? (1) The number of applicants who did not pass either examination was equal to the number who passed the written examination only. (2) There was a total of 100 applicants. 8. Is the integer n even ? (1) is odd. (2) is an integer. 9. If today is Carols birthday, how old is Carol? (1) 6 years ago she was half her present age. (2) 3 years from now she will be 3 times as old as she was 7 years ago. 10. If x, y, and z are positive, what is the value of x ? (1) x + y = z + y (2) z – y = 4 – y 11. Is x an integer ? (1) is an integer. (2) x – 4 is an integer. 12. If y 0, is y greater than x ? (1) 3x = 2y (2) x + y = 5 13. Did the population of Country S increase by less than 20 percent from 1965 to 1975 ? (1) The population of Country S in 1965 was 180 million. (2) The population of Country S in 1975 was 1.17 times what it was in 1965. 14. If a and b are positive integers, is ? (1) 3a = 2b (2) For integers m and n, a = 2m and b = 3n 15. G, P, and S are animal s