49. N除以3的余数是多少？
A. N除以2 余1
B. N+1除以3 余2
50. 正方体内有以内切球，直径为6，求正方体内最长的一条对角线长度
51．一正方形，10 <长< 20, 5<宽<9, 求周长范围
52．
A. S, T 关系
B. t > 1
题目记不清，但是通过A, 求出T 有两值1，2，根据B，可确定T=2, 则答案选C
53. 卖门票 on Monday & Tuesday, children’s ticket $7 each, adult $10 each, children’s number on Tues is twice the number on Monday, adult’s number on Tues is ½ the number on Monday, the total revenue on Monday is $2700, revenue on Tuesday is $2400, what’s the children’s number on Monday?
54. –2
55．3个不同的旗子排列视为一个信号，有四面不同的旗子，可排成几个信号？
56．从50加到100的和？
57．孩子们拿笔，either 3 pens , 2 pencils, or 1 pen, 3 pencils, the average pen number is 1.6, what’s the average pencils number? (the number is not accurate)
58. lottery $16 billion, separate as gifts, government payment, and expense, give the relation of payment and gift & the relation of payment and presentation, ask the payment in $ amount
59. 7 red tomatoes, 5 green tomatoes, ask the probability of all 3 tomatoes are red ….
60. 某数的80%是多少? (具体叙述忘了，但翻译过来就是求这个式子)
61. Is xy >x^2y^2
A. 14X^2=3
B. Y^2=1
62. Mary 和 Tom 同时从a地出发到b地，问Mary 比 Tom早到几分钟?
A. a地到b地距离100miles.
B. Mary的小时速度 比 Tom小时速度快5 miles.
63. r>1, r * = 1-(1/r) what’s the value of : r * - (r-1)*
64. Is xyz>0
A. XY>0
B. YZ>0
65. A (0,3) B (-2,0), C在AB上，C的横坐标是-5，求纵坐标？（数不准，有图）
66．People in Senior only is 16, ppl in physics only is 24. ppl in senior only + ppl both in senior and physics = ppl in physics only. What’s the percentage does ppl both in senior and physics account for all senior ?
67. 一个三角形x,y,z，分别为三个外角，确定x的度数？
A. x=y
B. x=z
68. DS 根据账户里的钱付费用问题，$400 之内付1。5%，超出部分付1.2%, 求某人上月账户里有多少钱？
（题目叙述长，数不准）
69. 溶液问题：10单位混合物，含有30%的A，70%的B，问要取去多少单位的混合物，换成A，使新的混合物中A、B各占50%？
[确认]20/7
[思路]设要取去X单位的混合物，解方程X*70%=10*(70%-50%)可得。
70. 集合题：参加股东会的人中62%为股东，47%为公司员工，问参加会议的是股东中不是员工的比例？
[确认]53%
[思路]62%-(62%+47%-100%)=53%
