The information disclosed herein is collected from the Internet and Chasedream.com is not responsible for the integrity and reliability. The document may be freely distributed, provided the original information is not modified and the chasedream.com is titled as collector of the information.
The information disclosed herein is collected from the Internet and Chasedream.com is not responsible for the integrity and reliability. The document may be freely distributed, provided the original information is not modified and the chasedream.com is titled as collector of the information.
The information disclosed herein is collected from the Internet and Chasedream.com is not responsible for the integrity and reliability. The document may be freely distributed, provided the original information is not modified and the chasedream.com is titled as collector of the information.
256. selling tickets, every five minutes to a group of 30 people from 9:00 to 5:55pm inclusive, $10 for adults and $6 for kids, one day, sold three times adults tickets to kids tickets sales revenue?
（12*8+11）*30=3210
4X=3210X=802.5 不明白为什么出现小数了~~
总额=3*802.5*10+802.5*6=28890$
--------------------------------------------
257. a bathroom door with a timer that sets the light reset for 15 minutes everytime someone enter or exit, ie if the door is opened by someone, the timer will turn the light on for fifteen minutes unless the door is opened again to reset it for another fifteen minutes estimated minutes that the light is off during 8am to 10 am.
a chart is given with the time that the door is opened during the period
8:00 8:03 .........9:39 (can only remember these end time, just be familiar with the meaning, I spent a lot of time on understanding the problem)
没明白题目意思
------------------------------------
258. how many canyons in the box?
1) evenly divided by a group of four kids, 3 left over
2) .........................by a group of three kids, 2 leftover (not sure about the number)
260. Mary invested M dollars for interest rate n percent simple annually and Kevin invested K dollars for x percent compound semiannually whose total interest is more in first two years
选C --------------------------------------------------------------- 269. In a certain day, a museum sold 30 tickets in every 5 minutes from 9:00(am) to 5:55 (pm), inclusive. Only two types tickets were sold, $10 value and $6value. If the number of $10 tickets sold is 3 times the number of the $6 tickets sold, what is the total revenue in the day?
同256题
--------------------------------------------------------------- 270. Three quarts of chemical A contain 10% of hydrogen peroxide. A different chemical B, which contains 40% of hydrogen peroxide, will be mixed with the 3 quarts of A. How much B should be added to the A so that the resulting mixture contains 30% of hydrogen peroxide? 6；设增加x升B x*40%+3*10%=(x+3)30% x=6
--------------------------------------------------------------- 271. Is the standard deviation of a certain set greater than 15,000? 1). The range of the set is 25,000 2). The mean of the set is 150,000
--------------------------------------------------------------- 272. Set S consists numbers arranged in ascending order. A new set is created as the follows: each elements of S is increased by a value equal to that number's place within the set. By how much is mean of new set greater than mean of the original set? 1). S consists of 10 elements. 2). The sum of the elements in the original set is 100 A．条件1，假设原有有a1,a2....an个数且和为sn,那么新的集合的数就是a1＋1,a2＋2....an＋n，新集合的平均数＝[sn+n(n+1)/2]/n=sn/n+(n+1)/2.所以新集合的平均数比原集合的平均数大（n+1）/2.所以由1）可以知道n，因此也就知道结果了。但是2）不能。因为数集的和一样但元素可能有很多种
273. A jar contains 10 red balls and 10 green balls. If 3 balls are removed at random without replacement, what is the probability that all 3 balls removed from the jar are green? C103/C203=2/19 --------------------------------------------------------------- 274. Is R2 + S2 =0 ? 1). R+S=0 2). 3R2 + 4R2 =0 B ---------------------------------------------------------------
275. Of the 15 members in a club, 2/3 can speak English, 2/5 can speak French, 1/3 can speak Spain, and only one can speak all three languages. How many people can speak exactly two languages? 答案：415*2/3+15*2/5+15*1/3-15-1*2=4
277. In 2002, Tony's earned more annual salary than Peter's. During each of the two following years, both them acquired 3% annual salary increasing. From 2002 to 2004, by what percent did their salary difference increase? Answer: Let the salaries in 2002 be x and y, respectively. Then, the difference in 2002 is x-y The difference in 2004 is x*1.032-y*1.032 The increase percent is (x*1.032-y*1.032)-(x-y)/(x-y)=(1.03)2-1
278. A bus traveled to its destination at speed of 60km/h. On the return trip, the bus traveled the same distance, but had an average speed of 80km/h, making the trip 2 hours shorter. What is the total distance of the round trip?
-------------------------------------------------------- 281.Plane P, Q tangent on the sphere S, point M on P, and N on Q. What’s the distance of PQ? (1) , Q parallel (2) Radius of the Sphere S is …
我选C，（前提是P、Q不重合，不过按题目意思应该不会重合的。）
-------------------------------------------------------- 282.在560人中，能否确定采取以下策略的人数：新招聘，扩大生意，或者两者兼有。（注意：题中没有说所有人都必须采取这些策略） (1) 140 person chose New employment (2) 80 persons Both strategies
我选E
-------------------------------------------------------- 283.A is ahead of B by 10m, at different constant speed, the same direction, 问B多久才能追上A (1) B’s speed is 10m/h faster than the speed limit and A’s is 10m/h slower than the speed limit (2) B’s speed is …
A
-------------------------------------------------------- 284.A line’s slope is between 5-10, and point (2,3) is on the line. 问以下哪些点在直线上 选项 (4, 6) (4, 10) (4, 46) …
290.Solution A contains 10% salt and solution B contains 15% salt. If 200 units of A and 300 units of B are mixed, the resulting solution will contain what percent of salt?
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2006-10-17 21:49:00
楼主
, Q parallel
