跪求解答。。。PREP的题目。。。

翁羽凌虚 · 发表于 2011-4-29 20:08:02

1、if x-y>10,is x-y>x+y?
(1)x=8
(2)y=-20
为什么第二个可以单独确定啊？不是应该是x-y>10 x+y>-30么？为什么啊？？？

2、A manufacturer produced x percent more vidoe cameras in 1994 thant in 1993 and y percent more video cameras in 1995 than in 1994. If the manufacturer produced 100 cameras in 1993, how many video cameras did the manu.... produce in 1995?
为什么 x+y+(x*y)/100=9.2可以单独求出来啊？我很费解啊。。。。。

3、In the fraction x/y ,where x,y are positive integers, what is the value of Y?
(1) least common denominator of x/y and 1/3 is 6.
恩这个条件是不够的
但是我觉得如果最小公分母是6 那Y 不就是2了么
等等
Y 是不是可以使6？

4、另外一个题： In 1999 companyX 's gross profit was what percent of its revenue?
(1) In 1999 its gross profit was 1/3 of its expense
(2) In 1999 its expense were were 3/4 of its revenue. 这两个条件为什么都可以单独求出来啊？

翁羽凌虚 · 发表于 2011-4-29 20:09:01

顺便再问个逻辑题：
104. Although the discount stores in Goreville’s central shopping district are expected to close within five years as a result of competition from a SpendLess discount department store that just opened, those locations will not stay vacant for long. In the five years since the opening of Colson’s, a non-discount department store, a new store has opened at the
location of every store in the shopping district that closed because it could not compete with Colson’s.
Which of the following, if true, most seriously weakens the argument?
(A) Many customers of Colson’s are expected to do less shopping there than they did before the SpendLess store opened.
(B) Increasingly, the stores that have opened in the central shopping district since Colson’s opened have been discount stores . B
(C) At present, the central shopping district has as many stores operating in it as it ever had.
(D) Over the course of the next five years, it is expected that Goreville’s population will grow at a faster rate than it has for the past several decades.
(E) Many stores in the central shopping district sell types of merchandise that are not available at either SpendLess or Colson’s.

小唯唯 · 发表于 2011-5-1 18:20:41

话说……第一个题，只要y<0就成立了………………x-y>x+y 解得，y<0 所以y=-20<0所以成立

哈哈~~第二个题我碰到了，当时也做错了~~设1993年为A，从已知应该得到的式子是：1995年的=A*（1+x/100）(1+y/100)=A*(1+x/100+y/100+XY/10000) 带入100得 1995年=100+x+y+xy/100
将条件 x+y+(x*y)/100=9.2 直接带入就可以了~~ 95年=100+9.2=109.2哈~~

第三题，是的

第四，只要知道 revenue-expense=gross profit 就好啦~~~随便知道一个比例关系就可以求出来了

跪求解答。。。PREP的题目。。。

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