关于GWD中的几道数学题。。。。（GWD答案我总觉得不可靠~~）

cjjfred0622

1. If n is a positive integer,what is the remainder when (7^(4n+3))(6^n)is divided by 10?
 A. 1   B.  2    C.   4      D.    6     E.   8        GWD KEY    E         MINE.  D
2.The sides of a square region, measured to the nearest centimeter are 6 centimeters long.The least possible value of the actual area of the square region is?
A.  36.00    B.   35.00    C.  33.75       D.30.25     E. 25.00    GWD KEY     D
3.If the average of the assessed values of x houses is 212000,y other houses is 194000,what's the average of the assessed values of the(x+y) houses?
1. X+Y=36      2.X=2Y
选项大家都知道，答案是两个在一起才充足。
4.Last year in a group of 30 businesses,21reported a net profit and 15 had investment  in a foreign market,How many of the businesses did not report a net invest in foreign markets last year?
1.last year 12 of the 30 businesses reported a net profit and had investments in foreign markets.
2.last year 24of the 30 businesses reported a net profit or invested in foreign markets,or both.
选项类似，答案是第二个成立，第一个不成立。
求大神指点一二。。。。我511杀鸡，现在做GWD有用吗？

chachamao

楼主到底问啥捏？

是4道gwd题的解法，还是说质疑答案的真实性，还是只是问问511考试，现在做GWD的必要性？

我数学也差就不误导你了；GWD挺好，还是做吧

ymcheswin

1，个位数：
7^1:7                 7^5:7  
7^2:9                 7^6:9
7^3:3                 7^7:3
7^4: 1                7^8:1

7^(4n+3): 3
6^n:6
相乘：3*6=18，所以最终乘积末尾数必然是8，选E  

2，题目问可能的面积的最小值，边长四舍五入为6，最小边长是5.5，平方为30.25

3，answer is B，OA is wrong

4，Answer is D

3,4题的答案是在美国GMAT论坛上的讨论结果