先谢啦！快考试了，还有这些问题没解决，请帮忙解决下吧！最好是有思路或过程。

Promble  Solving

1.At a cetain diner,a hamburger and coleslaw cost $3.59,and a hamburger and french fries cost $4.40.If french fries cost twice as much as coleslaw,how much do french fries cost?

A.$0.30  B.$0.45  C.$0.60  D.$0.75   E.$0.90

2.The market value of a certain machine decreased by 30 percent of its purchase price each year.If the machine was purchased in 1982 for its market value of $8000,what its market value two years later?

A.$8000    B.$5600   C.$3200    D.$2400   E.$800

3.A rectanglar floor is covered by a rug except for a strip pmeters wide along each of the four edges.If the floor is mmeters by n meters,what is the area of the rug,in square meters?

A.mn-p(m+n)   B.mn-2p(m+n)   C.mn-p2   D.(m-p)(n-p)   E.(m-2p)(n-2p)

4.There are between 100 and 110 cards in a collection of cards.If they are counted out 3 at a time,there are 2 left over,but if they are counted out 4 at a time,there is 1 left over.How many cards are in the collection?

A.101   B.103   C.106   D.107   E.109

5.A tourist purchased a total of $1500 worth of traveler`s checks in $10 and $50 denominations,During the trip the tourist cashed 7 checks and then lost all of the rest.If the number of $10 checks cashed was one more or one less than the number of $50 checks cashed,what is the minimum possible value of the checks that were lost?

A.$1430   B.$1310   C.$1290   D.$1270   E$1150

6.If the number of square units in the area of circle C is twice the number of linear units in the circumference of C,what is the number of square units in the area?

A.4   B.8   C.4pi   D.8pi   E.16pi

7.Salesperson A`s compensation for any week is $360 plus 6 percent of the portion of A`s total sales above $1000 for that week.Salesperson B`s compensation for any week is 8 percent of B`s total sales for that week.For what amount of total weekly sales would both salespeople earn the same compensation?

A.$21000    B.$18000    C.$15000    D.$4500    E.$4000

Data Sufficiency

1.On a certain day it took Bill there times as long to drive from home to work as it took Sue to drive from home to work.How many kilometers did Bill drive from home to work?

(1)Sue drove 10 kilometers from home to work,and the radio of distance driven from home to work time to drive from home to work was the same for Bill and Sue that day.

(2)The ratio of distance driven from home to work time to drive from home to work for Sue that day was 64 kilometers per hour.

2.How many integers n are there such that r<n<s?

(1)s-r=5  (2)r and s are not integers.

3.If b is the product of three consecutive positive integers c,c+1,and c+2,is b a multiple of 24?

(1)b is a multiple of 3, (2)c is odd

4.                  DAILY TRAIN   SCHEDULE

         Train    Scheduled Departure Station S                 Scheduled Arrival Station T

          X           7:08                                                          8:10

The table above shows the morning schedule for train X.If Juan took train X on Monday morning,did he arrive at station T on schedule?

(1)Juan arrived at station T on Monday morning 1 hour and 2 minutes after he left station S.

(2)Juan arrived at his office at 8:30 on Monday morning,which was 20 minutes after he arrived at station T.

5.What is the probability that events A and B both occur?

(1)The probability that event A occurs is 0.8

(2)The probability that event B occurs is 0.6

6.Is x negative?

(1)n^3(1-x^2)<0   (2)x^2-1<0

请问答案是不是 E 啊？

如果面积的值等于周长值的2倍，那么就有下面的等式：

pi*r^2=2*2*pi*r

可算出 r=4。那么面积的值 pi*r^2 就等于 16pi。

不知道这样的计算方法是否正确。

[此贴子已经被作者于2008-10-17 16:12:11编辑过]