共有六题想请教 1. Can a certain rectangular sheet of glass be positioned on a rectangular tabletop so that it covers the entire tabletop and its edges are parallel to the edges of the tabletop? (1) The tabletop is 36 inches wide by 60 inches long. (2) The area of one side of the sheet of glass is 2,400 square inches. Ans: E 2. Was the average (arithmetic mean) weight of the package mailed at a certain post office yesterday greater than 600 grams? (1) The total weight of the packages mailed at the post office yesterday was greater than 14,500 grams. (2) Fewer than 25 packages were mailed at the post office yesterday. Ans: C Fewer than 25 是有包含25吗?? 3. Juan bought some paperback books that cost $8 each and some hardcover books that cost $25 each. If Juan bought more than 10 paperback books, how many hardcover books did he buy? (1) The total cost of the hardcover books that Juan bought was at least $150. (2) The total cost of all the books that Juan bought was less than $260. Ans: C 我怎麽算都觉得paperback books的数量不一定 4. For any integers x and y, min(x, y) and max(x, y) denote the minimum and the maximum of x and y, respectively. For example, min(5, 2) = 2 and max(5, 2) = 5. For the integer w, what is the value of min(10, w) ? (1) w = max(20, z) for some integer z. (2) w = max(10, w) Ans: D 想问第一项为什麽也可以?? 5. Harvey teaches a certain number of biology students in 2 classes, K and L. He can divide the students in class K into 7 groups of n students each. He can divide the students in class L into 6 groups of p students each with 1 student left over. How many students are in class L ? (1) n = p (2) There are 5 more students in class K than in class L. Ans: C 我觉得第一个就可以单独成立了=> 7P=6P+1 => P=1 6. If the range of the six numbers 4, 3, 14, 7, 10, and x is 12, what is the difference between the greatest possible value of x and least possible value of x ? A. 0 B. 2 C. 12 D. 13 E. 15 Ans: D range是12的话 x 不就是15吗?? -- --

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