[1006G]xiaoyaozi5566的GRE数学解题站

MercurySonUID: 2765276

167# xiaoyaozi5566
谢谢喽,我也是这么认为的,看来答案错了~~

amberxjjUID: 2698036

真诚求救……
29. The price of product R is 20 percent higher than   
   the price of product S, which in turn is 30
   percent higher than the price of product T. The
   price of product R is what percent higher than
   the price of product T?
   (A) 60%  (B) 56%  (C) 50% (D) 44% (E) 25%
答案选B。

30、 If x is 11又1/9 percent more than y, then y is what percent less than x?
(A) 9%
(B) 10%
(C)  11又1/9%
(D)  12//1/2%
(E) 15%
答案选B。

这种百分比的题，简直绕晕了我了……可怎么办呢，哇哇哇哇哇……

解答：
29。R=120%S, S=130%T，两式可得R=1.2*1.3T=1.56T，选56%
30.11又1/9=100/9，所以x=（1+100/9 %）y=10/9y,多10%
by xiaoyaozi

MercurySonUID: 2765276

我对95~09大白本上的以下几道数学题的答案深表怀疑,不知大家有没有同感:
1.练习题二SECTION2的12题
2.练习题四SECTION3的6题
3.练习题四SECTION3的25题
4.练习题四SECTION5的12题
5.练习题六SECTION3的13题
另外,黄皮最新模考的数学部分貌似有一些题也印错了.:)

小鬼和灵UID: 2634304

143# 小鬼和灵

谢谢解答 另外想问下 怎么确定取4的时候最小，取2的时候反而最大呢？
我做的时候就认为4最大，结果小于200 就直接选B了……

夜雨润花UID: 2697286

23# susuyaa

怎末是八呢？ 谁给解答一下？ 没看懂

azbrmUID: 2690849

what is the maximum number of cubes with sides of a length that could fit inside a cube with sides of length 2s?
这个题目是什么意思呢，不是太了解，特别是那个2s? 谢谢

解答：
这个题目应该是少了条件
by xiaoyaozi

azbrmUID: 2690849

a car dealer who gives a customer a 20percent discount on the list price of a car still realizes a net profit of 25percent of cost. if the dealer's cost is $4800, what is the usual list price of the car?
这道题是怎么算的呢，我算出来和答案不一样，答案是7500，谢谢

the diagonal of the floor of a rectangular closet is 7.5 feet. the shorter side of the closet is 4.25 feet. what is the area of the closet in square feet?
这道题该怎么做呢？谢谢

解答：
the dealer's cost 4800是指车的成本价，题目说的是当卖车的给了买主20%的优惠时，仍然能获得成本价25%的利润。因此利润就是4800*25%=1200。所以卖出去的价格是4800+1200=6000。而6000是折扣后的，不打折的话就该是6000/80%=7500

7.5是对角线长度，4.25是一条边的长度，根据勾股定理求出另外一条边，然后将两条边相乘就得到答案了
by xiaoyaozi

XeniagogoUID: 2707022

which of the following cannot be a factor of 2的 i 次方*3的 j 次方  [条件是 i & j 都是positive integers!!!]
a. 6
b. 8
c. 27
d. 42
e. 54

那8=2*2*2 跟3没有关系呀！~


If n is an integer divisible by 6 but not by 4, then which of the following cannot be an integer?
答案n/12

为什么？？？

Thanks a lot~

解答：
1.如果确定i，j是positive的话，答案确实有问题
2.如果n/12是整数的话，那么n就能被12整除，因此也能被4整除，与条件矛盾
by xiaoyaozi

flowersoundlinUID: 2745819

最新模拟题八 section3 29题
David and Michael charged  Mr.J 3000 to remodel his basement. To complete the project, David worked 4days alone,Michael worked 1days alone, and they worked 10days together, if they each received the same amount of money for each day they have worked, how much of 3000 did David received?
A1800
B1750
C1680
D1575
E1200

我选的是1800 但是答案是1680， 我不知道是怎么算出来的 请教？
thanks!

解答：
Michael工作了11天，David工作了14天。因此3000要分成25份，每份是120.David的钱应该是120*14=1680
by xiaoyaozi

cucu_816UID: 2644659

同问

夜雨润花UID: 2697286

陈向东 那本书里面后面的120道题里面的几个题 不太理解  求快速解答

30。During a sale at an office supply store, for every box of paper clips purchased for 15 cents, a second box can be purchased for 4 cents. how many boxs of paper clips did Paul buy if he spent 91 cents on boxes of paper clips?
答案 为什么是 9？

20。what is the maximum number of cubes with sides of a length that could fit inside a cube with sides of length 2s?
这题什么意思？ 答案怎末是64？

还有事第35题 为什么选E 有书的同学麻烦看看！

62。 exactly three years before the year in which Anna was born, the year was 1980-x. In terms of x, on Anna's twentieth birthday, the year will be?
答案为什么是？ 这题什么意思？

84。A CHILD withdraws from his piggy bank 10% of the original sum in the bank. If he must add 90 /C  to bring the amount in the bank back up to the original sum, what was he original sum in the bank?
这题什么意思? 答案是$9

94. if the following were arranged in order of magnitude, which term would be the middle number in the series?
什么意思？ 答案是3^3-1

后天早上就要出发去济南考试了 还望朋友们能看到后尽快帮我解答这几个问题了，谢谢大家！

解答：
30. 买一个的话15，多买一个就是4，也就是买两个花19，所以买的时候要看成两个一对。买四对就是4*19=76，再买一个就是15，加起来就是91了。所以一共是9个
20.条件少了
62.你确定题目写完整了吗？
84.拿走了10%，必须补充90 cents（美分).所以90美分就占10%，原来的总量就是900美分，也就是9美元
94.题目没写完整吧……
by xiaoyaozi

xiaoyaozi5566UID: 2510336

143# 小鬼和灵  

谢谢解答 另外想问下 怎么确定取4的时候最小，取2的时候反而最大呢？
我做的时候就认为4最大，结果小于200 就直接选B了……
小鬼和灵 发表于 2010-6-7 21:40

是4最大啊……但算出来的结果是大于200的，你算错了

xiaoyaozi5566UID: 2510336

23# susuyaa  

怎末是八呢？ 谁给解答一下？ 没看懂
夜雨润花 发表于 2010-6-7 22:11

看的是下降的年数，就是我用红色圆圈标出来的，一共是8年

irvine666UID: 2575525

辛苦辛苦，腰子

azbrmUID: 2690849

177# azbrm
明白了，谢谢