4.27考G 数学PREP模考新题求大神解答！！

lilydong58 · 发表于 2013-4-24 16:59:55

今天做了第一次prep的模拟哇感觉数学比OG上的难很多 VERBAL好像简单一点据说prep是比真题简单哇？
数学有好几道看了答案想了N久还是不会哪放上来大家一起讨论讨论顺便做做新题！

1、QUANTITIVE
Before being simplified , the instructions for computing income tax in Country R were to add 2 percent of one's annual income to the average (arithmetic mean) of 100 units of country R's currency  and 1 percent of one's annual income(表示看不懂 ><). Which of the following represents the simplified formula for computing the income tax, in Country R's currency , for a person in that country whose annual income is I?
A  50+ I/200
B  50+3I/100
C  50+ I/40
D 100+I/50
E 100+3I/100

答案 c
因为题目不明白所以没有思路

2、DATA SUFFICIENT
The cost of a square slab is proportional to its thickness and proportional to the square of its length . What is the cost of a square slab that is 3 meters long and 0.1 meters thick?
(1) the cost of a square slab 2 meters long and 0.2 meter thick is $160 more than the cost of a 2 meters long and 0.1 meter thick square slab
(2) the cost of a square slab 3 meters long and 0.1 meter thick is $200 more than the cost of a 2 meters long and 0.1 meter thick square slab

答案 D.each  sufficient

我的理解：
题目说cost和thickness和square of length都成正比，但比例不知道。
（1）能告诉我们cost和thickness的比
（2）能告诉我们cost 和length的比
所以不是应该both together sufficient?
而且我理解cost不是应该和square slab的面积/体积成正比为神马是和length成正比？

3、QUANTITIVE
A certain  city with  a population of 132000 is to be divided into 11 voting districts , and no districts is to have a population more than 10 percent greater than the population if any other district.  What is the minimum possible population that the least populated district will have?
A 10700
B 10800
C 10900
D 11000
E 11100

答案：D
表示不知道该怎么算><

还有一题觉得应该算HARD难度放上来给大家看看

最上面的数轴，字母从左到右为r,s t.
4、DATA SUFFICIENT
On the number line shown, is zero halfway between r and s?
(1) s is to the right of zero
(2)the distance between t and r is the same as the distance between t and -s

答案：C both together sufficient
解答：(1) NS ,只说零点在s左边，未说是否在r s 中点
      (2) NS,这两者的距离相等，有两种可能，1是零点在s r中间，-s等于r；2是零点在t右方，-s在t的右边。
(1)+(2) sufficient 排除了2中的第二种可能。

希望大神帮YY解答前3题哇。还有什么问题大家一起讨论。GMAT必胜！！！！

fchandhj · 发表于 2013-4-24 19:27:26

第一题就是I的2% +average 等于收的税
那average 等于谁呢？等于（100块钱+1%的I）/2
不知你理解了没

第二题，你给的 E each sufficient D才是each sufficient
我觉得 2个随便哪个都行了。算单位体积价格

第三题，就是求最小值范围嘛。设人数X1,X2。。。。。X11  从小到大排列可等于
那现在问你最小值X1 范围是多少？
首先 X1+X2+.....+X11肯定大于等于11个X1
而X2，X3......X11撑死是X1的1.1倍
所以X1+X2+.....+X11肯定小于等于12个X1
所以132000大于等于11个X1 小于等于12个X1
得  X1大于等于11000 小于等于12000
所以只有D E可以  又问你minimum of the possible least population
你说选谁呢？

lilydong58 · 发表于 2013-4-24 19:35:04

fchandhj 发表于 2013-4-24 19:27
第一题就是I的2% +average 等于收的税
那average 等于谁呢？等于（100块钱+1%的I）/2
不知你理解了没

嗯懂了!所以语文没学好数学也没学好- - 谢谢fchandhj!

dianyanmao · 发表于 2013-9-21 21:10:54

第二说跟厚成比，跟长成比，那就是跟体积也是成比的。那两个条件的体积比其实就是价格比了。那就都能算出来了

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