8月11-13日数学机经总结[转帖]

1.one area, 1/3room owned and 2/3 rent.only 2,3,4 bedrooms.the percentage of rent 2 bedrooms to total 2 bedrooms.
1) 2/5 owned rooms are 2 bedrooms
2) 3/5 total rooms are 2 bedrooms
答案：C

2.watch three movies, 30 people watch at least one movie, how many people watch only one movie?
1) 12 people see three movies
2) 20 people see at least two movies.
答案： B

3.一个跑道宽15英尺，跑10圈，问沿外面跑的比里面跑的多跑多少？
答案：圆的方的？呵呵，题目不太清楚，不过大家知道这类题怎么算就可以了

4.A stock purchase price $12, sell at 90% buy price, B buy $8, sell 95% buy price. A sell 10000 shares and B 40000 shares. Average sell price?
答案：8.24

5.第二题是一个3*3方格，从上到下为a11-a33。说这九个数取自1，2，3，而且各行，各列不能重复。问a11？
1) a22+a33=6
2) a12+a13+a21+a31=12
答案： D

6.教授将7个学生分派3个项目，一个3人，一个2人，一个2人，问多少种排法。
答案：C(3,7)*C(2,4)

7.买衣服$3.95 shopping plus $29.95 each, ask how many clothes?
1) total charge 290 2) total charge 300
答案：A(发文作者的答案，我没怎么明白意思，呵呵，大家讨论一下)

8.四个连续偶数，medium?
1) Maximum is 36
2) Mimimum is 30
答案：D

9.X/Y余9,X/Y=96.12,問Y=?
選項有(1)96 (2)75 (3)48...四跟五数字不确切了
答案：75

10.問3X+5Y=?
(1) X/0.5 + Y/0.3=某數
(2) X/0.3 + Y/0.5=某數
答案：A