241.三个数，问mean是否等于medium：
a）告诉medium是多少
b）最大的数、最小的数与中数各自的差均为2。 B

242. 1994年fax量80 billion，the annual number of fax increased by 700 percentage from 1987 to 1994，问1987的fax量是多少billion ?
ANS: 10

243.DS:n 是一个两位整数, 问n的十位是几?
a. 10n的百位是2 b. the tenth of n-9 is 1 (即n-9 的十位是1) A

244.有24磅P物质，有25磅R物质，分别从P物质和R物质中各取出若干，按照4：1的比例合成混合物X；再从P物质和R物质中取出若干，按照1：5的比例合成混合物Y。求混合物X有多少磅？
解：设从P物质中取出A磅，从R物质中取出B磅来合成X,则X共A+B磅；从P物质中取出24-A磅，从R物质中取出25-B磅来合成Y。
A-B=4：1, (24-A)：（25-B）=1：5，连立两式：A=20, B=5. X=A+B=25

245.N是能被14整除的整数，问N是多少？
（1）3N能被5整除 （2）N能被28整除 E

246.X/Y=? (1)Y=X+10 (2)Y=1.01X B

247. n为正整数，n是某个正整数的平方，求n的因子数一定是什么数？
（1）一个奇数 （2）不记得 （3）一个质数 （2）可以排除 ANS: (1)

248.(X+C)^2的算式中，X可以为所有实数，C为一个常数，C是多少？
（1）C>0 (2)C^2=16 C

249.n=0.67K9, 能否判断K是否小于3？
（1）n精确到千分位，n=0.673 (2)n精确到百分位，n=0.67 ANS: A

250.L和M驾驶一辆车一同行驶(L和M各行驶一段路程)，平均速度为90mile/ hour.。求L的平均速度是否大于80？
（1）M的平均速度大于100 （2）M的时间大于L的时间
C

251.有一对整数，求它们的和是多少？
（1）至少有一个数为正整数 （2）至少有一个数为负整数C

252. A company invests in certain product in 1994, what’s the total amount in 1995
a. Monthly interest is ??% （real number）
b. The investment is $???

253． The mean of x, y, z is 10, x i. 9
ii. 10
iii. 11
a.I only
b. II only
c. III only
d. I and III
e. I, II, and III

254． A retailer sell red and white t-shirts in both medium and large size. The number of medium white sold is 3 times as many as large red sold. The number of medium white sold is 2 times that of large white. Total revenue of red is 80, total revenue of white is 190 Grand total is $1080. how much is the medium white ? (number are close, but not exactly accurate, just get the concept, number doesn’t matter).

255． {Sqrt(x)+ Sqrt(y) } / (Sqrt(x) -Sqrt(y)) - Sqrt(24)/ {Sqrt(x)^2- Sqrt(y)^2}, simply the above equation. 5 choices. Just use (a^2-b^2=(a+b)(a-b), you can easily identify the answer)

256． 6 balls, numbered 1-6, pick one at a time without replacement (exact words， faint again), the order doesn’t matter, what’s the possible combination
a. 10
b. 20
c. 30
d. 40
e. 50 这题搞了我很久，丢脸，大侠帮忙看看，数字因该准确，总之不上百

257． What is the reminder of x when it is divided by 9
a. Know the remainder of x when it is divided by 3
b. Know the remainder of x when it is divided by 3

258． N is a two-digit number, what’s the tens of n?
a. The tens of 2n =5
b. The tens of 2n=0

259． X increase annually by 20% in 1994 and 1995, Y increase by 40% in 1994 then by 1% of the amount of the previous year in 1995. which of the following must be true.
a. X-y<2
b. 0 c. 0 d. 0 e. ??

260． xy>0
a. |x|=|y|
b. x^2=y