GRE数学辅导：最新gre猴哥数学难题解析(二)

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　　下面为大家总结了最新的gre猴哥数学难题。有很多gre考生对gre数学考试十分苦恼，其实最有效的方法就是多练习，把数学基础知识记牢，这样才能在考试中对答如流。而gre数学考试中也会出现一些难题，想拿高分也十分不容易。
　　11. In the equation above, k, r, s, t, and v represent positive numbers. Multiplying which one of these numbers by 2 will reduce the value of n to 1/2 of its present value?
D. t    E. v</p>　　12. A certain money market account that had a balance of $48,000 during all of last month earned $360 in interest for the month. At what simple annual interest rate did the account earn interest last month?
' I) u- [3 e) o9 n& t( E　　A. 7%    B.7.5%    C.8%    D.8.5%    E.9%
" X4 G7 P- i$ S) L8 A/ O　　13. Column A: The two-digit integer that equals twice the sum of its digits
　　      Column B: 16
: z! n& S8 I1 O1 ]9 O　　14. A car travels at an average speed of 80 kilometers per hour during a 6 - hour trip and averages 75 kilometers per hour for the first 4 hours of the trip. Which of the following distance-versus-time graphs is consistent with this information?
% f5 ^: k( E: @D. 60-year-old females</p>　　E. 80-year-old females
　　18. Approximately how many more 10-year-old children were there in 1980 than in 1986?
　　A. 100,000       B.200,000       C.300,000       D. 400,000       E.1,000,000
　　19. The population of females was greater in 1980 than in 1986 for approximately what percent of the ages from 0 to 100 years?
/ a( T; @* z/ [; ?+ M9 a　　A. 15%     B.25%     C.55%     D.75%     E.85%
　　20. In 1980 the ratio of the number of males to the number of females was greatest for which of the following ages?
0 E3 S3 a7 e6 Z* {3 A( a　　A. 10     B. 30     C.50     D.70     E.90
, b; B$ \9 d/ F* M! x! s2 T　　最新的gre猴哥数学难题中有很多gre数学考试中常见的难题，而且难题涉及的范围也比较广泛，考生在复习时一定要多注意日常的练习和积累。