六年级中英文奥数题1
小学英语奥数题
小学英语奥数题1、Six trees are equally spaced along one side of a straight road. The distance from the first tree to the fourth is 60 feet. What is the distance in feet between the first and last trees?2、At the end of 2005 Walter was half as old as his grandmother. The sum of the years in which they were born is 3860. How old will Walter be at the end of 2006?3、The digits 1,2,3,4 and 9 are each used once to form the greatest possible even five-digit number. What is the digit in the tens place?4、Every edge of a cube is colored either red or green. In order to have at least one red edge on every face of the cube, find the minimum number of edges that must be colored red.5、When 31513 and 34369 are such divided by a certain 3-digit number, the remainders are equal. Find this remainder.6、Three signal lights were set to flash every certain specified time. The first light flashes every 12 seconds, the second flashed every 30 seconds and the third one every 66 seconds, the signal lights flash simultaneously at 8:30 am. At what time will the signal lights next flash。
六年级中英文奥数题1
10.There is asquarewhose sides are 1 dm. A first cuts off of the square and B cuts off oftheremaining area.Then A cuts off of the remaining area and B cuts off of the area left,……After A and B cut the square in the same manner for three times, how manysquaredecimeters is the area left?
3、六个小朋友在一起做游戏。他们每人想一相整数写在卡片上交给老师，老师用不同的方式把其中5人写的数加在一起，得到以下6个数：87、92、98、99、104、110。那么卡片上写的数中最接近平均数的是什么数？
3.Six children playgames.Each of them writes down anintegeron a card andgives the card to a teacher.The teacheradds up any 5 of thesixnumbersin different waysand gets the following six numbers:87, 92, 98, 99, 104and 110.So what number on the six cards is closestto the average number?
601中英文小学数学竞赛题
601中英文小学“挑战杯”知识竞赛数学试卷（六年级）时间：60分钟总分100成绩：一、填空题（每题4分，共28分）1. 19941994×19941993－19941995×19941992=2.从A地到B地，甲需要40分钟，乙需要50分钟，甲比乙快分之。
3. 同学们去社区做好事，每组6人或9人，都正好剩1人。
这些同学至少有（）人。
4. 一个长方体木箱，体积是324立方分米，它的宽和高都是6分米。
这个长方体木箱的底面积是（）平方分米。
5.将1000个一样的小正方体粘合成一个大正方体，再把它的表面涂上油漆，那么完全没有被涂到油漆的小正方体有（）个。
只有2个面被涂漆的小正方体有（）个。
6.十几辆卡车运送315桶汽油,每辆卡车运的桶数一样多,且一次运完.那么, 每辆卡车运（）桶.7.一个半圆的半径是10厘米，它的周长是( )厘米二、解答题8.（6分）我校派15名教师带五、六年级学生参加今年区办运动会。
师生一起，每3人里有一个五年级学生，每4人中有一个六年级学生，那么五、六年级共去了多少个学生？9.（6分）一条绳子用去全长的三分之一多4米，剩下的部分比用去的部分多2米。
这条绳子全长多少米？10.（6分）如果将长方体的长增加3厘米，那么，原长方体的体积就会增加60立方厘米。
或者将长方体的宽增加4厘米，那么体积就会增加96立方厘米。
或者将长方体的高增加5厘米，体积就会增加150立方厘米。
问原长方体的表面是多少平方厘米？11.（6分）小明小红小亮三人每人拿出同样多的钱共购进一些钢笔，可小明与小亮每人都比小红多分了6支，于是，他们俩每人给小红12元钱，那么你猜每支钢笔的价钱是多少？12.（6分）鸡和兔子共46条腿，如果原来的鸡变成兔子，兔子变成鸡，腿就只有38条了，那么鸡兔一共有几只？13. （6分）一批本子分发给六年级一班学生，平均每人分到6本。
若只发给女生，平均每人可分到10本，若只发给男生，平均每人可分得多少本？14.（6分）一杯水，第一次喝去它的一半，然后补上喝去的二分之一。
小学六年级英文奥数竞赛题
小学六年级英文奥数竞赛题班级：_________ 姓名：__________走进美妙的数学花园比赛介绍“走进美妙的数学花园”中国青少年数学论坛活动是一项面对小学三年级至初中二年级学生的综合性数学活动。
通过“趣味数学解题技能展示”、“数学建模小论文答辩”、“数学益智游戏”、“团体对抗赛”等一系列内容丰富的活动提高广大中小学生的数学建模意识和数学应用能力，培养他们一种正确的思想方法，使广大青少年在生动有趣的数学学习中感受到陈省身先生所说的“数学好玩”、“数学之美”和“数学是有用的”，实现从“学数学”到“用数学”过程的转变，从而进一步推动我国数学文化的传播与普及。
2006英文奥数竞赛题1、Six trees are equally spaced along one side of a straight road. The distance from the first tree to the fourth is 60 feet. What is the distance in feet between the first and last trees?2、At the end of 2005 Walter was half as old as his grandmother. The sum of the years in which they were born is 3860. How old will Walter be at the end of 2006?3、The digits 1,2,3,4 and 9 are each used once to form the greatest possible even five-digit number. What is the digit in the tens place?2007英文奥数竞赛题4、Every edge of a cube is colored either red or green. In order to have at least one red edge on every face of the cube, find the minimum number of edges that must be colored red.5、When 31513 and 34369 are such divided by a certain 3-digit number, the remainders are equal. Find this remainder.6、Three signal lights were set to flash every certain specified time. The first light flashes every 12 seconds, the second flashed every 30 seconds and the third one every 66 seconds, the signal lights flash simultaneously at 8:30 am. At what time will the signal lights next flash together?Class: Name:( )1. Good morning! !A.Morning !B.Hello !C.Hi !( )2. Nice to see you again ! .A.How are you ?B.Nice to see you , too .C.How do you do ?( )3.Good night,mom !A.Night !B.Good night !C.Good evening .( )4.How do you do ?A.How are you ?B.Fine,thanks .C.How do you do ?( )5.How many story books do you have ?A.I have 10.B.I can see 10.C.Thirty yuan.( )6.Do you have new teachers?A.Yes,we do .B.Yes,we don’t.C.Yes,we have .( )7.Who’s your art teacher ?A.Mr Zhu.B.Miss Zhu.C.He’s tall.( )8.What’s he like?A.He’s tall and strong .B.Yes,he is.C.Mr Zhu.( )9.Is your English teacher young?A.No,she isn’t.B.Yes,she is .C.No,she is.( )10. ? Her name is Chen Jie.A.What’s your name ?B.What’s she name ?C.What’s her name ?( )11. ? I like Chinese,math and English.A.What classes do you like?B.What do you like?C.What are you like ? ( )12. ? We have English and P.E.A.What do you have on Mondays ?B.What do you have ?C.What do you have on Monday?( )13. ? It’s Monday.A.What is it today ?B.What day is it today ?C.What day is today ? ( )14. ? I watch TV and do my homework.A.What do you do ?B.What do you do in Mondays?C.What do you do on Sundays ?( )15.May I have a look ?A.Sure.Here you are .B.Look !C.Here you are .( )16.Our math teacher is Canada.A.fromB.inC.at( )17.I three new teachers.A.hasB.amC.have( )18.What’s Chinese teacher like ?A.youB.yourC.you’re( )19.My P.E.teacher is thin.A.tooB.soC.very( )20.There are days in a week.A.sixB.sevenC.eight( )21.There are month(月)in a year(年).A.tenB.elevenC.twelve( )22.I often watch TV Saturday .A.onB.inC.at( )23.I like P.E. I don’t lime music.A.butB.andC.so( )24.This is apple. It is red apple.A.a , aB.an,anC.an, a( )25.What do you like ?A.classesB.classC.class’s六年级英语测试题Class: Name:( )1. How are you ?A.Fine,thanks.B.Yes,it is.C.How are you ?( )2. Nice to meet you !A.Fine,thank you.B.OK.C.Nice to meet you ,too !( )3. How do you go to school ?A.I go to Canada by plane.B.I go to school by bike.C.What about you ? ( )4. How do you go to the USA ?A.I usually go to school by bus.B.I go to England by ship.C.I go by plane. ( )5. ? My home is near the post office.A. Where is your home ?B.OK.C.See you then!( )6. See you at 2 o’clock.A.See you then !B.The fifth floor.C.It’s easy.( )7. ? You can go by the No.15 bus.A.It’s not far.B. How can I get to Zhongshan Park ?C.Sure.( )8. Where is the hospital?A.Next to the cinema.B.Thank you .C.You’re welcome.( )9. Excuse me ,is there a cinema near here ?A.Yes,there is .B.No,it’s not far.C.It’s near the post office.( )10.? ? It’s near the post office.A.Yes,there is .B.No,it’s not far.C. Where is the library?( )11. ? It’s next to the hospital.A. Where is the cinema ,please ?B.Is it far ?C.Go straight.( )12. How can I get to the hospital ?A.It’s next to the hospital.B.You can go by the No.201 bus.C.Thank you. ( )13.Thank you .A.Thank you .B.OK.C.You’re welcome.( )14. How can I get to the museum?A.Go straight.Then turn left.B.Thank you .C.It’s east of the cinema . ( )15. Where is the post office ?A.Go straight.Then turn left.B.Thank you .C.It’s east of the cinema . ( )16. What are you going to do this evening ?A.I’m go ing to the cinema .B.I go to school on foot.C.Yes,it is.( )17. Is it far ?A.No,it is .B.Yes , it is .C.Yes,it isn’t.( )18. do you go to school ?A.WhatB.WhereC.How( )19. I go to school bike.A.onB. byC.get( )20. Can I go foot ?A.byB.atC.on( )21.How can I to the post office ?A.nearB. getC.for( )22. me.A. ExcuseB. HowC.next( )23. birthday to you !A. AfterB.HappyC.First( )24. The hospital is the left.A. atB.inC.on( )25. is the bookstore ?A.WhereB.HowC.When四年级英语测试题Class: Name:( )1.Good afternoon !A.Hello!B.Hi !C.Afternoon !( )2.Nice to see you again !A.How are you ?B.Hello !C.Nice to see you , too.( )3.Good night,moom !A.Good evening !B.Good night !C.Night !( )4.How are you ?A.Fine,thank you .B.I am 10.C.Nine .( )5.How do you do ?A.Fine ,Thank you .B.How are you ?C.How do you do ?( )6.How old are you ?A.How are you ?B.I am 11.C.I have 11.( )7. ? I have 23.A.How many books do you have ?B.How many books can you see?C.How many book do you have ?( )8. ? I can see 6.A.How many lights do you have ?B.How many lights can you see ?C.How many light can you see ?( )9.May I have a look ?A.Sure.Here you are .B.Look!C.Sure.Here are you .( )10. ? 50 yuan.A.How much is this schoolbag ?B.How many is this schoolbag ?C.How much are this schoolbag ?( )11.Where’s my seat ?A.It’s near the door.B.It’s on the door.C.It’s under the door. ( )12.Let’s clean the desks and chairs.A.All right !B.Hello !C.It’s nice .( )13.What’s this ?A.There is a board .B.It’s a bee.C.It’s bee.( )14. ? My name is Mike.A.Here are you ?B.What’s your name ?C.How do you do ? ( )15.Who’s the inventor of paper ?A.Chinese people.B.Oh! Great !C.Hello!( )16.I a student. You a teacher.A.am ,amB.are, areC.am, are( )17.This a boy.His name Zhang Peng.A.is, isB.am , isC.is , are( )18.Let clean the fish bowl.A.IB. meC.my( )19.This is apple.It is red apple .A.an ,anB.a, aC.an, a( )20.We a new classroom.A.areB.haveC.has( )21.There a bee in our classroom.A. isB.areC.am( )22. have a new schoolbag. schoolbag is heavy.A.I , myB.I ,MyC.My , I( )23.Put your English book your head.A.atB.inC.on( )24.There many books in the desk.A.amB.isC.are( )25.How many do you have ? A.pencil B.pencils C.pencils. 三年级英语测试题Class: Name:( )1.当向别人打招呼时，应该说：A.Hello.B.Good morning .( )2.How are you ? 的正确答语是：B.I’m fine,thank you .( )3.当想知道别人的名字时，应该说：A.What’s your name ?B.See you.( )4.字母K的小写是：A.kB.( )5.Nice to meet you 的意思是:A.见到你很高兴。
全英文小学数学六年级试卷
Instructions: Please answer all questions. Show your work for full credit.1. Solve the following equation:3x + 4 = 192. Find the area of a rectangle with a length of 8 units and a width of 5 units.3. Simplify the following expression:(2x - 3) + (4x + 5)4. Write the following fraction in simplest form:14/215. Solve the following inequality:3x - 5 > 106. Find the perimeter of a triangle with side lengths 4 units, 6 units, and 8 units.7. Solve the following proportion:3/4 = 6/x8. Write the following decimal as a fraction:0.259. Solve the following system of equations:2x + 3y = 7x - y = 110. Find the mean of the following set of numbers:9, 12, 15, 18, 2111. Simplify the following expression:(3x^2 + 4x - 1) - (2x^2 - 3x + 5)12. Write the following mixed number as an improper fraction:2 3/413. Solve the following quadratic equation:x^2 - 5x + 6 = 014. Find the volume of a cylinder with a radius of 3 units and a height of 5 units.15. Solve the following word problem:A basketball team scored 45 points in the first half of a game. In the second half, they scored 60% more points than the first half. How many points did they score in the second half?16. Find the surface area of a cube with a side length of 4 units.17. Solve the following word problem:A recipe calls for 3 cups of flour for every 2 cups of sugar. If you have 4 cups of flour, how many cups of sugar are needed?18. Write the following decimal as a mixed number:0.619. Simplify the following expression:(2x^2 + 5x - 3) / (x - 1)20. Solve the following word problem:A train travels at a speed of 60 miles per hour. If it takes 3 hours to reach its destination, how far is the destination from the starting point?Good luck!。
6年级英语奥数题及答案
6年级英语奥数题及答案做习惯了数学的奥数题，你们对英语的奥数掌握多少呢?偏科的学生不是好学生哦，下面是小编为你们准备的关于6年级的英语奥数题目以及相关的奥数答案，希望能帮助你们。
6年级英语奥数题目(一) 1、In 2004, 16 June falls on a Wednesday. On what day of the week will 16 June fall in 2010?2、In a magic square the sum of the numbers in each row, in each diagonal and in each column are equal. In this magic square the value of x is:3、If half of a number is 30, then three-quarters of that number is____.4、The sum of the digits of the following product 9995555、Three positive integers have a sum of 28. The greatest possible product that these integers can have is_____.6、Jack was trying to tessellate regular pentagons. He managed the following figure. The size of angle .a. is______.7、If the area of the shaded region of the regular hexagon in the diagram below is 36 cm2, the area of the whole hexagon in cm2 is_____.8、In what follows, □and are different numbers.When 503 is divided by □the remainder is 20.When 503 is divided by the remainder is 20.When 493 is divided by □x the remainder is_____.9、A lady, her brother, her son and her daughter (all related by birth) played volleyball. The worst players twin (who is one of the four players) and the best player are of opposite.The worst player and the best player are of the same age.Who cannot be the worst player(s)?A) brother only B) daughter onlyC) son and daughter onlyD) lady and daughter onlyE) lady only10、If you continue the given number pattern, in what row and in what position in that row will the number 320 be?1 -------------- row 12 3 -------------- row 24 5 6 -------------- row 37 8 9 10 -------------- row 4The answers are given in the order of row; position.6年级英语奥数题目(二) 1、Did you know? In the decimal number system (base 10) ten different digits, 0 to 9 are used to write all the numbers. In the binary number system (base 2) two different digits are used, i.e. 0 and 1.Which one of the following numbers is not a valid number in the octal number system (base 8)?A) 128 B) 127 C) 126 D) 125 E) 1242、The number of diagonals that can be drawn in a regular polygon with twenty sides (icosagon) is_____.3、If a and b are integers, 103=1,1527=3, and then 3796 is equal to_____.4、Two numbers are in the ratio 2 : 3. When 4 is added to each number the ratio changes to 5 : 7.The sum of the two original numbers is____.5、The greatest number of Mondays which can occur in 45 consecutive days is____6、Saul plays a video game in which he scores 4 for a hit and lost 6 for a miss. After 20 rounds his score is 30. The number of times he has missed is____.7、Three girls A, B and C run in a 100 m race. When A finishes, B is 10 m behind A and when B finishes C is 20 m behind B. How far in metres was C from A when A finished?(Lets assume all the athletes run at a constant speed)8、The areas of the faces of a rectangulabox are 84 cm2 , 70 cm2and 30 cm2.The volume of the box in cm3 is____.9、You have 3 weights: 1 kg, 3 kg and 9 kg as well as anequal arm balance, as shown. How many different weight objects can you weigh with these three?[Remember the weights may be placed on either side]6年级英语奥数题目答案(一)1、Wednesday2、123、454、27(求数位上上的数字之和)5、28=9+9+10，因此答案为8106、36度7、1088、503-20=483 483=3723=2123，因此□x =483，因此此题余数是109、D10、25，20(二)1、A 考察我们学过的简单的进制问题，显然8进制中没有8出现2、170 找规律，公式为n(n-3)23、1 定义新运算，就是求3796的余数。
全新的小学英语奥数题
1、An ant and a blind spider are on opposite corners of a cube. The ant is stationary and the spider moves at random from one corner to another along the edges only. What is the expected number of turns before the spider reaches the ant? Optional: Also solve for a square, octahedron, icosahedron, and dodecahedron.AnswerThe answer is 10.If the spider started at a corner diagonally on the same face as the ant the answer would be 9, and if the spider started at an adjacent corner the answer would be 7.Here are answers for other figures:Square: 4Octahedron: 6Dodecahedron: 35Icosahedon: 152、（无答案）、（无答案）The principal of a new elementary school sounded the alarm for fire training. It took a very long time to empty the building. It was evident that the schoolchildren were at ri sk. The school has three exterior doors. The main door is served by a wide corridor, th e side door by a narrower corridor, and the rear door by a dog-legged corridor.By experimenting with the classrooms adjacent to each of these doors, it was determin ed that:About 1.5 minutes elapse between the announcement of an emergency and the first de parture through each door.Students and staff can file through the doors at these rates approximately 55 per minut e through the main door, 30 per minute through the side door, and 25 per minute through the rear door.About 450 persons are inside the building.Calculate for the problem the minimum time until the building emptiesa.4.1b.1.5c.5.3d.5.6e.8.183、Ahmad bought 4 boxes of marbles and 5 packs of cards for $12.30. John bought 3 packs of cards and 2 packets of drinks for $8.70. Soon Lee bought 2 boxes of marbles, 5 packs of cards and 3 packets of drinks. How much did Soon Lee pay altogether?（Ahmad 买了4盒弹子，5盒卡片，合计12.30; John 买了3盒卡片，2包饮料，合计8.7； 不久，Lee 买了2盒弹子，5盒卡片和3包饮料，请问Lee 总共化了多少？）多少？）4、joshua and corrine had an equal amount of money. joshua spent $15 per day while corrine spent $28. when joshua had $180 left corrine had $76 left. how much did corrine had at first?(Joshua 和 Corrine 有相等数量的钱，Joshua 每天化15 而Corrine 每天化28， 当Joshua 剩180时Corrine 只剩下76，请问Corrine 开始的时候有多少钱？)5.Mr Tan had 1.5 litre of white paint in Tin A and 1.25 litre of blue paint in Tin B. He poured 750 ml of blue paint from Tin B into Tin A. Next, he poured some of the mixture in Tin A back into Tin B. if 7/11 of the final mixture in Tin B was made up of blue paint, what was the volume of the mixture in Tin A that Mr Tan had poured into Tin B?(Mr Tan 有一罐1.5升白漆（Tin A), 一罐1.25 升蓝漆(Tin B). Mr Tan 从B 罐里倒出750ml 蓝漆到A 罐，接着，他又把混合在A 罐里的漆倒回到B 罐。
英语奥数1
1、Six trees are equally spaced along one side of a straight road. The distance from the first tree to the fourth is 60 feet. What is the distance in feet between the first and last trees?2、At the end of 2005 Walter was half as old as his grandmother. The sum of the years in which they were born is 3860. How old will Walter be at the end of 2006?3、The digits 1,2,3,4 and 9 are each used once to form the greatest possible even five-digit number. What is the digit in the tens place?4、Every edge of a cube is colored either red or green. In order to have at least one red edge on every face of the cube, find the minimum number of edges that must be colored red.5、When 31513 and 34369 are such divided by a certain 3-digit number, the remainders are equal. Find this remainder.6、Three signal lights were set to flash every certain specified time. The first light flashes every 12 seconds, the second flashed every 30 seconds and the third one every 66 seconds, the signal lights flash simultaneously at 8:30 am. At what time will the signal lights next flash。
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9. Find out 3 natural numbers among 100 naturalnumbersfrom 1 to 100, so that the sum of these three numbers’reciprocals is 1.
8、有20包花生给一只猴子吃，一包只能吃一天，但不能连续两天都吃（即今天吃了，明天就不能吃），且间隔的天数彼此不同。那么，这20包花生至少要多少天才能吃完？
8.20 bags ofpeanutswill be used to feed amonkeyand one bag of peanuts can only last for one day.The monkey cannot eat peanuts every two continuous days (if it eats peanuts today, it cannot eat themtomorrow) and the interval days should be different.So how many days at least will it take the monkey to eat up these 20 bags of peanuts?
11、3个六面体都是按照相同的规律涂有红、黄、蓝、白、黑、绿6种颜色（如图）。黄色对面是（）色，白色对面是（）色，红色对面是（）色。
11.As shown below, 3 hexahedrons are paintedwith6 colors ofred, yellow, blue, white, blackand green according to the same rule.So the color opposite yellow is ( ), the color opposite white is ( ) and the color opposite red is ( ).
12、大毛、二毛、三毛每天早晨都要在运动场上进行长跑训练。一天，他们在200米跑道的同一起跑线上同时起跑，当三毛正好跑完一圈时，二毛超过三毛 圈，大毛超过三毛半圈，这天早晨他们共跑了15圈。如果他们始终以各人的速度跑步，那么他们每人各跑了几圈？
12.A, B and C tooklong-distance running trainingon the playgroundevery morning.One day,they startedat the same time from the same starting line of the 200-meterrunway. When C finisheda circle, Bwas circleahead of C and Awashalf circle ahead of C. They altogether ran 15 circles.Ifthey keptrunning with constant speeds, how many circles didthey run respectively?
10、有一个边长为1分米的正方形，甲先划去正方形面积的 ，乙接着划去剩下面积的 ，然后甲又划去剩下面积的 ，乙再划去剩下面积的 ，……，依次类推。如果两人分别划了三次，此时这个正方形还剩下多少平方分米没有被划去？
10.There is asquarewhose sides are 1 dm. A first cuts off of the square and B cuts off oftheremaining area.Then A cuts off of the remaining area and B cuts off of the area left,……After A and B cut the square in the same manner for three times, how manysquaredecimeters is the area left?
5、给10位学生发铅笔，每人3支还剩下一些，每人4支又不够。如果剩下的和不够的同样多，那么共有多少支铅笔？
5. Divide pencils among10 students.There will be some pencils left if each student is given 3 pencils and it will not be enough to give each student 4 pencils.Given that the number ofthepencils left is equal to the number of the insufficient pencils, how many pencils are there totally?
3、六个小朋友在一起做游戏。他们每人想一相整数写在卡片上交给老师，老师用不同的方式把其中5人写的数加在一起，得到以下6个数：87、92、98、99、104、110。那么卡片上写的数中最接近平均数的是什么数？
3.Six children playgames.Each of them writes down anintegeron a card andgives the card to a teacher.The teacheradds up any 5 of thesixnumbersin different waysand gets the following six numbers:87, 92, 98, 99, 104and 110.So what number on the six cards is closestto the average number?
6、甲、乙、丙丁进行象棋比赛，每两人之间要赛一盘。规定胜一盘得2分，平一盘各得1分，输一盘不得分。甲、乙、丙共得10分，丁得多少分？
6.A, B, C and D play chess andevery two peopleneed to compete once.It is ruled that winning will bring 2 marks, a draw will bring 1 mark and losing will bring no marks. A, B and C altogether get 10 marks, so how many marks does D get?
必记词汇
insufficient[,insə'fiʃənt]adj.不足的
draw[drɔ:]n.平局；抽签v.抽
proportion[prə'pɔ:ʃən]n.比例
hexahedron[,heksə'hedrən] n.六面体
补充词汇
shuffle['ʃʌfl]n.洗牌v.洗牌
compete[kəm'pi:t]v.竞ion Mathematics Exercise6Bfor Grade Six
1、一条船顺水航行48千米，再逆水航行16千米，共用了5小时；这条船顺水航行32千米，再逆水航行24千米，也用了5小时。求这条船在静水中的速度。
1.It takes aboat5 hours tosail48 kmdownstream and16 kmupstream.And it also takes the boat 5 hours to sail32 kmdownstream and24 kmupstream.So what is the speed of this boat in still water?
interval['intəvəl]n.间隔；间距
'
词组句型
account for占…比例；对….做出解释
sell out卖完；卖光
eat up吃光
constant speed恒速；匀速
ahead of在…之前
2、有一所学校，男生占学生总人数的 ，学生总人数与男生人数都是三位数，组成这两个三位数的六个数字正好是1、2、3、4、5、6。问：这所学校有多少学生？
2.In a school, boy students account for of all the students.It is known that the number of all the students andthenumber of boys are both three-digit numbers and the six digitsmaking upthese two three-digit numbers are1, 2, 3, 4, 5and 6.So how many students are there in this school?
4、现在一副去掉大小王的扑克牌，共52张。把它们洗匀后，分成A、B两组，各26张。请问：在1000次洗牌中，A组中的黑牌数和B组中的红牌数，有几次会完全相同？
4.There is a set of playing cards,a total of 52cards,whichdoesnot include the big king andthelittle king.After being shuffled, the cards are divided into A and B groups, 26 cards in each group.So in 1000 times of shuffle, how many times will the number of black cards in Group A beexactlyequal to the number of red cards in Group B?
7、甲、乙两人卖商品，甲的比乙多10个，可是全部卖出后的收入都是15元。如果甲的商品按乙的价格出售可卖18元，那么，甲、乙各有多少个商品？
7.A and B sell commodities. A has 10 more commodities than B, but both of them gain a profit of 15 yuan after selling out their commodities.If A sells hiscommoditiesaccordingto B’s price, he will get 18 yuan.So how many commodities do A and B have respectively?