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204.
19682-!-item-!-187;#058&012407 On a certain sight-seeing tour, the ratio of the number of women to the number of children was 5 to 2. What was the number of men on the sight-seeing tour?
(1) On the sight-seeing tour, the ratio of the number of children to the number of men was 5 to 11.
(2) The number of women on the sight-seeing tour was less than 30.
答案选C，less than怎么可以推出正确答案呢？
159.
15957-!-item-!-187;#058&010660 If n is a positive integer and r is the remainder when (n - 1)(n + 1) is divided by 24, what is the value of r ?
(1) n is not divisible by 2.
(2) n is not divisible by 3.
答案选C，如果N=1怎么办?
If $1,000 is deposited in a certain bank account and remains in the account along with any accumulated interest, the dollar amount of interest, I , earned by the deposit in the first n years is given by the formula I = 1000*((1+r/100)^n – 1) , where r percent is the annual interest rate paid by the bank. Is the annual interest rate paid by the bank greater than 8 percent?
(1) the deposit earns a total of $210 in the first two years (2) (1+r/100)^2 > 1.15
A,为何不能选D
61. 5157-!-item-!-187;#058&004472 Of the 60 animals on a certain farm, 2/3 are either pigs or cows. How many of the animals are cows?
(1) The farm has more than twice as many cows as it has pigs.
(2) The farm has more than 12 pigs.
答案选C，more than怎么可以推算出正确数字呢？
110.
11364-!-item-!-187;#058&007646 The residents of Town X participated in a survey to determine the number of hours per week each resident spent watching television. The distribution of the results of the survey had a mean of 21 hours and a standard deviation of 6 hours. The number of hours that Pat, a resident of Town X, watched television last week was between 1 and 2 standard deviations below the mean. Which of the following could be the number of hours that Pat watched television last week?
(A) 30 (B) 20 (C) 18 (D) 12 (E) 6
答案选D，算不来 | 
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发表于 2008-11-28 23:35:00
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