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18. What is the hundredths digit of the decimal z ?
(1) The tenths digit of 100z is 2.
(2) The units digit of 1,000z is 2.
这体完全搞不动100后的Z是什么意思，是100*z or 100.Z????? （答案D)
169. If the integers a and n are greater than 1 and the product of the first 8 positive integers is a multiple of a^n, what is the value of a ?
(1) a^n = 64
(2) n = 6
这题答案是B,但我觉得它是错的：n等于6并没有确定a的取值
200. Of the 1,000 companies responding to a certain survey, what percent indicated that they had a business recovery plan?
(1) 200 of the companies did not indicate that they had a business recovery plan.
(2) The number of companies that indicated that they had a business recovery plan was 4 times the number that did not indicate that they had a business recovery plan.
此题答案是D,但是题目只是说responding,弃权即不选也是respondng 的一种，不是吗？
203. What is the remainder when the positive integer x is divided by 6?
(1) When x is divided by 2, the remainder is 1; and when x is divided by 3, the remainder is 0.
(2) When x is divided by 12, the remainder is 3.
这题完全不知如何下手（答案是D)
214.The cost of a square slab is proportional to its thickness and also proportional to the square of its length. What is the cost of a square slab that is 3 meters long and 0.1 meter thick?
(1) The cost of a square slab that is 2 meters long and 0.2 meter thick is $160 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.
(2) The cost of a square slab that is 3 meters long and 0.1 meter thick is $200 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.
此题答案同样是D,但我觉得是E. 就第一条信息来说，因为slab同时与长度的平方和厚度成比例关系（题目中并没有假设这两种比例是否相等）而该信息并没有给出长度平方（square of length) 的比例关系,所以我觉得应该算不出答案
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发表于 2010-2-11 22:32:54
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