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数学渣渣来向大家求助了，求指点⬇️1.Machine A can process 6000 envelopes in 3 hours. Machine B and C working together but independently can process the same number of envelopes in 2+2/3 hours. If machines A and C working together but independently process 3000 envelops in 1 hour, then how many hours would it take machine B to process 12000 envelpes?
A.2 B.3 C.4 D.6 E.8
备注： 参考答案是8，但是我怎么算都不是它。。。我算出来9.6.。
2.In a certain law firm there are five senior partners and five junior partners and all senior partners receive bonuses greater than those of the junior partner. Does senior partner Johnson receive the largest bonus of the lawyer at the firm?
(1) Johnson receives a bonus greater than twice the average bouns for all the senior partners.
(2) All partners receive some bonus, and Mr. Johnson receive 5 times the average given to all the partners.
参考答案：B
3. Tom bought only $0.39 stamps and $0.15 stamps. How many $0.39 stamps did he buy?
(1) He bought $5.4 worth of stamps.
(2) He bought an equal number of $0.39 stamps and $0.15 stamps.
参考答案：A 我选的C,感觉要两个条件才够用啊。。光A推不出来
4. What is the median number of employees assigned per project for the projects at Company M?
(1) 40% of the projects at Company M have 3 or fewer employees assigned to each project.
(2)30% of the projects at Company M have 5 or more employees assigned to each project.
参考答案： C 我选的E,题干中并没有告知剩下的30%是是什么情况。what if the rest of the projects have 4 employees assigned to eache project.
5. A teacher will assign each student in a group of n students to one of m classrooms. If 3<m<11<n, is it possible to assign each of the n students to one of the m classrooms so that each classroom has the same number of students assigned to it?
(1) It is possible to asssign each of 11n students to one of m classrooms so that each classrooms has the same number of students assigned to it.
(2)It is possible to assign each of 3n students to one of m classrooms so that each classrooms has the same number of students assigned to it.
参考答案： A
6. Right triangle ABC is to be constructed in the xy-plane so that the right triangle is at A and BC is parallel to the x-axis. The x- and y-coordinates of A,B and C are to be integers that satisfy the inequalities -5<x<6 and 2<y<15. How many different triangles with these properties could be constructed?
A. 120 B.1200 C. 9000 D.11880 E.12000
参考答案： D
7. A company has 13 employees, 8 of whom belong to the union. If 5 people work any one shift, and the union contract specifies that at least 4 union members work each shift, then how many different combinations of employees might work any given shift?
A. 10 B.231 C.336 D.350 E.406
参考答案： E
8. A jar contains 20 marbles: 4 red, 6 white and 10 blue. If you remove white marbles at one time, randomly, what is the minimum number that you must be removed to be cetain that you have at least 2 marbles of each color?
A. 6 B. 10 C.12 D.16 E.18
参考答案： E
9. At Tyler High School, there are twice as many girls than boys on the yearbook staff. At one staff meeting, the percentage of grils attending was twice the percentage of boys. What percentage of those attending were boys?
A. 20 B. 25 C. 30 D.33 E.50
参考答案： A 错选了D,不知道D错在了哪儿
10. A marketing firm determined that, of 280 households suvrveyed, 90 used neither Brand A or Brand B soap, 70 used only Brand A soap, and for every household that used both brands of soap, 4 used only Brand B soap. How many of the 280 households surveyed used both brands of soap?
A. 15 B. 20 C.30 D.40 E.45
参考答案： D
题干里有一句话没读懂， for every household that used both brands of soap, 4 used only Brand B soap..然后整道题目都懵了
拜托大家啦 |
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发表于 2016-8-6 11:12:58
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