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Q14:
How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1 mile = 1,160 yards)
A. 8
B. 9
C. 10（答案）
D. 11
E. 12
我做的是约等于1.5s
Q8:
Note: Figure not drawn to scale.
图形为一个正方形，三横把正方形平分,每份宽3，三竖不均等但距两边长度相等设为x，中间为白色，几块黑白相间
The figure above represents a square garden that is divided into 9 rectangular regions with indicated dimensions in meters. The shaded regions are planted with peas, and the unshaded regions are planted with tomatoes. If the sum of the areas of the regions planted with peas is equal to the sum of the areas of the regions planted with tomatoes, what is the value of x?
A. 0.5
B. 1
C. 1.5（答案）
D. 2
E. 2.5
我算的是2.25
Q22:
A certain company assigns employees to offices in such a way that some of the offices can be empty and more than one employee can be assigned to an office. In how many ways can the company assign 3 employees to 2 different offices?
A. 5
B. 6
C. 7
D. 8（答案）
E. 9
我算的是10
Q19:
At a certain company, 25 percent of the employees are male and 50 percent of the employees are sales staff. What is the number of employees at this company?
(1) Exactly 7 of the employees at the company are males who are sales staff.
(2) There are 16 more female employees than male employees at the company.
答案为b，为什么 不能选d呢？
Q2:
If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p >1/2 ?
(1) More than 1/2 of the 10 employees are women.
(2) The probability that both representatives selected will be men is less than1/10 .
答案为e,为什么不能选b?
Q28:
This year Henry will save a certain amount of his income, and he will spend the rest. Next year Henry will have no income, but for each dollar that he saves this year, he will have 1 + r dollars available to spend. In terms of r, what fraction of his income should Henry save this year so that next year the amount he was available to spend will be equal to half the amount that he spends this year?
A. 1/(r+2)
B. 1/(2r+2)
C. 1/(3r+2)
D. 1/(r+3)
E. 1/(2r+3)(答案)
看不懂题目。。。。
Q9:
If an integer n is to be chosen at random from the integers 1 to 96, inclusive, what is the probability that n(n + 1)(n + 2) will be divisible by 8?
A. 1/4
B. 3/8
C. 1/2
D. 5/8（答案）
E. 3/4
不会算。。。。
Q16:
What is the probability that a student randomly selected from a class of 60 students will be a male who has brown hair?
(1) One-half of the students have brown hair.
(2) One-third of the students are males.
答案e，为什么啊?这类题不选c，是因为少了什么条件吗？ |
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发表于 2010-3-21 13:35:15
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