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 retailer¹ 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 replacement² (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 reminder³ 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 annually⁴ 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