【導(dǎo)讀】cereal.Ifxandyarepositive,is4x>3y?isafactorofn?Isx>k?(1)2x?2k=4. (2)9x?3k=81. Ifxandyarepositive,whatisthevalueofx–y?

　　

【正文】 Answer: Q12: If r, s, and w are positive numbers such that w = 60r + 80s and r + s = 1, is w 70? (1) r (2) r s 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: Q13: What is the value of the integer n? (1) n(n + 2) = 15 (2) (n + 2)n = 125 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: Q14: If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5letter code words to the number of 4letter code words? 5 to 4 3 to 2 2 to 1 5 to 1 6 to 1 Answer: Q15: Which of the following fractions has a decimal equivalent that is a terminating decimal? Answer: Q16: For any integer k greater than 1, the symbol k* denotes the product of all the fractions of the form , where t is an integer between 1 and k, inclusive. What is the value of ? 5 Answer: Q17: Company S produces two kinds of stereos: basic and deluxe. Of the stereos produced by Company S last month, were basic and the rest were deluxe. If it takes as many hours to produce a deluxe stereo as it does to produce a basic stereo, then the number of hours it took to produce the deluxe stereos last month was what fraction of the total number of hours it took to produce all the stereos? Answer: Q18: A certain machine produces 1,000 units of product P per hour. Working continuously at this constant rate, this machine will produce how many units of product P in 7 days? 7,000 24,000 40,000 100,000 168,000 Answer: Q19: If 5x – 5x 3 = (124)(5y), what is y in terms of x? x 6 x 3 2x + 3 2x + 6 Answer: Q20: Lines k and m are parallel to each other. Is the slope of line k positive? (1) Line k passes through the point (3, 2). (2) Line m passes through the point (3, 2). 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: Q21: Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show? (1) During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows. (2) During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows. 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: Q22: The number of defects in the first five cars to e through a new production line are 9, 7, 10, 4, and 6, respectively. If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median? 3 7 12 A. I only B. II only C. III only D. I and III only E. I, II, and III Answer: Q23: + x y z d m e n f The figure above shows two entries, indicated by m and n, in an addition table. What is the value of n + m? (1) d + y = 3 (2) e + z = 12 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 suff