The toll for crossing a certain bridge is $0.75 each crossing.Drivers who frequently use the bridge may instead purchase a sticker each month for $13.00 and then pay only $0.30 each crossing during that month.If a particular driver will cross the bridge twice on each of x days next month and will not cross the bridge on any other day, what is the least value of x for which this driver can save money by using the sticker?
A.14
B.15
C.16
D.28
E.29 选B A怎么不对呢
Q2:
A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetic order.What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?
A.4
B.5
C.6
D.7
E.8 选B
E.8 选B
Q25:
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 选D
Q32:
Does the decimal equivalent of , where p and q are positive integers, contain only a finite number of nonzero digits?
(1)p > q
(2)q = 8 选B 我觉得E对啊
Q7:
A school administrator will assign each student in a group of n students to one of m classrooms.If 3 < m < 13 < 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 assign each of 3n students to one of m classrooms so that each classroom has the same number of students assigned to it.
(2)It is possible to assign each of 13n students to one of m classrooms so that each classroom has the same number of students assigned to it.
选B 我觉得D对
Q3:
If the units digit of the three-digit positive integer k is nonzero, what is the tens digit of k?
(1)The tens digit of k + 9 is 3.
(2)The tens digit of k + 4 is 2. 选A
Q19:
Yesterday each of the 35 members of a certain task force spent some time working on project P.The graph shows the number of hours and the number of members who spent that number of hours working on project P yesterday.What was the median number of hours that the members of the task force spent working on project P yesterday?
A.2
B.3
C.4
D.5
E.6 选E 我觉得问题文的是小时数啊 可是答案答的怎么是人数呢
Q10:
In the figure shown, two identical squares are inscribed in the rectangle.If the perimeter of the rectangle is 18√2, then what is the perimeter of each square?
A.8√2
B.12
C.12√2
D.16
E.18 选B 这个“对号”怎么理解呢
Division R of Company Q has 1,000 employees.What is the average (arithmetic mean) annual salary of the employees at Company Q?
(1)The average annual salary of the employees in Division R is $30,000.
(2) The average annual salary of the employees at Company Q who are not in Division R is $35,000.
选A 我觉得该是C 第一个条件只能求出R部门的 不能代表Q啊
Q18:
The function f is defined by f(x) = √x – 10 for all positive numbers x.If u = f(t) for some positive numbers t and u.What is t in terms of u?
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发表于 2009-3-31 20:09:00
