2. In the fourth grade, 60 students went to plant trees, with an average of 4 trees per person, just after planting. Later, some students were sent. At this time, everyone can plant three trees on average to complete the task. How many students were sent?
3. Several students calculate the average score of their Chinese exam together. If Zi Han's score increases by 13, their average score will reach 90, and if Zi Han's score decreases by 5, their average score will be only 87. How many students are there?
4. Nine Lake Central Primary School has 100 students who participated in the math competition, with an average score of 63, including 60 for boys and 70 for girls. How many boys and girls are there?
5. The average of A and B is 26, that of B and C is 28, and that of A and C is 2 1. Find the average of a, b and c.
6. Zi Han took part in the sports standard test, and the average score of five events was 85. If the throwing score is not included, the average score is 83 points. How many points did Zi Han score in throwing?
7. If the average age of four people is 23, and none of them is younger than 18, how old is the oldest person?
8. The average of five numbers is 45. Arrange these five numbers from small to large. The average of the first three numbers is 39, and the average of the last three numbers is 53. What is the third number?
9. Zi Han participated in three math competitions, with an average score of 84. It is known that the average score of the first two competitions is 82 points. How many points did he score in three competitions?
10. In the final exam, Zi Han's average score in four subjects was 92 before the math scores were announced, but after the math scores were announced, his average score dropped by 1. How many points did Zi Han get in the math exam?
1 1. If the average age of three people is 22 years old, and no one is younger than 18 years old, what is the oldest person?
12 ... If the average age of four people is 25 years old, and no one is younger than 16 years old, and these four people are not equal in age, how old is the oldest person? How old is the youngest person?
13. In a mountaineering activity, Zi Han walked up the mountain 50 meters per minute, and then walked down the mountain 75 meters per minute according to the original road. How many meters does Zi Han walk up and down the mountain every minute?
14. A classmate read a story book, reading 25 pages every day for the first 4 days, then reading 40 pages every day for 6 days. How many pages does the student read on average every day?
15. Zi Han reads a story book, 25 pages a day for the first 4 days and 200 pages for the next 6 days. How many pages does the student read on average every day?
16. Han Qi scored an average of 96 points in five exams (out of 100), so how many points should she get in each exam?
Fourth grade application questions 1
1. Grandma went to buy fruit. She bought 4 Jin of pears and 5 Jin of lychees in 68 yuan. The price of 1 kg pear is the same as that of 3 kg litchi. How much is 1 kg pear and 1 kg litchi?
Three baskets of apples and five baskets of oranges weigh 330 kilograms. The weight of each basket of apples is twice that of each basket of oranges. How much does each basket of apples and oranges weigh?
Teacher Zhang bought books for the reading room. He bought six fairy tale books and seven story books, and spent 102 yuan. Three fairy tales and five story books cost the same. How much does it cost to buy 1 a fairy tale book and 1 a story book?
4. A batch of grain was shipped out from the grain depot. Four bags of rice and five bags of flour weigh 600 kilograms, and four bags of rice and seven bags of flour weigh 680 kilograms. How many kilograms does each bag of rice and flour weigh?
1, standard oil drum, oil * * * weighs 7kg. Uncle Ma, the driver, has used half of the oil, and now the barrel weighs 4 kilograms. How many kilograms of oil are there in the barrel? How many kilograms of oil is there in this barrel of oil? How much does this bucket weigh?
A bottle of perfume weighs 50 grams. The perfume is half used and the bottle weighs 30 grams. How many grams of perfume are there? How many grams does this bottle weigh?
A bottle of wine weighs 80 grams. After drinking half the wine, the bottle weighs 50 grams. How many grams of wine are there? How many grams does this bottle weigh?
A bottle of soda weighs 45g. After using half the soda, the bottle weighs 25 grams. How many grams of soda are there? How many grams does this bottle weigh?
1, there are 6 boxes of eggs, and each box has the same number of eggs. If you take out 50 eggs from each box, the number of eggs in the remaining six boxes is exactly the same as that in the original five boxes. How many eggs are there in each box?
There are 7 baskets of apples, and the number of apples in each basket is equal. If you take out 40 apples from each basket, the number of apples in the remaining 7 baskets is exactly the same as that in the original 5 baskets. How many apples are there in each basket?
3. 5 boxes of biscuits, each box of eggs has the same weight. If you take out 40 grams from each box, the total grams left in the five boxes are exactly the same as those in the original three boxes. How many grams of biscuits are there in each box?
There are 6 classes in Senior One, and the number of students in each class is equal. If there are 30 students in each class, the number of students left in class 6 is exactly the same as that in class 2. How many students are there in each class?
1, Han Qi practices calligraphy and plans to write 100 words a day. In fact, she wrote four more words than planned every day. As a result, she finished the task one day ahead of schedule. How many words are you going to write?
2. Zhang Zihan has read a book and plans to read 15 pages a day. In fact, he reads three pages more than planned every day. As a result, he finishes the task two days ahead of schedule. How many pages are there in this book?
3. Road construction, originally planned to build 60 meters a day, actually built 8 meters more than planned every day. As a result, the task was completed four days ahead of schedule. How long is this road?
4. Michael Chen plans to do 30 paper crane projects every day, but in fact, it does 6 more projects every day than planned. As a result, the task was completed three days ahead of schedule. How many paper cranes do you plan to make?
1, Han Qi has 10 pictures, and Zheng Jie has 4 pictures. How many photos did Han Qi give Zheng Jie? How many photos do they have?
There are 52 glass balls in the red box and 34 glass balls in the blue box. Take three out of more boxes and put them into fewer boxes at a time. How many times does it take to make the number of glass balls in two boxes equal?
There are 68 sweets in the big bag and 28 sweets in the small bag. How many times have you taken four pieces from many bags and put them in several bags?
4. There are 25 upper shelves and 27 lower shelves, and my father bought 10. How can I put it so that there are as many books on the upper and lower shelves?
Fourth grade application problem 2
1. The TV factory installs a batch of TVs, 80 of which are installed every day. /kloc-The task can be completed in 0/5 days. How many TVs will be installed every day if it is to be completed three days in advance?
A factory saves 40 kilograms of coal every day. If every 8 kilograms of coal can generate electricity 16 kwh, according to this calculation, how many kwh of coal can be saved by the factory in September (calculated in 25 days)?
3. A workshop plans 20 people to work 8 hours a day, complete a batch of orders in 8 days, and then deliver the goods in advance. The goods will be completed by 32 people in 4 days. How many hours do you have to work every day?
4. Teacher Zhang from the general affairs office of the school went to the store to buy exercise books for the students. The exercise book was priced at 80 cents in 4 yuan, and he bought 900 copies with him. You can get a discount because you buy more. Each book is 30 cents cheaper. How many exercise books did Teacher Zhang buy back?
An engineering team is expected to use 20 people to dig a canal in 14. Digging for two days, plus 20 people, everyone's work efficiency is the same. Can you finish it a few days in advance?
6. The boiler room reserves 140 days of heating coal according to the daily consumption of 3,600kg. After heating for 40 days, 600 kilograms of coal can be saved every day due to technical transformation. How many days can these coals be heated?
7. The school canteen manager went to the farmer's market to buy eggs. Originally, he planned to buy 96 kilograms of eggs per kilogram of 5 yuan. As a result, the price of eggs fell, and he used the money to buy 24 kilograms of eggs. How much is the egg per kilogram after the price is lowered?
8. 18 people took part in the labor of moving brick piles, which is planned to be completed in 8 hours. After two hours of actual labor, six people were transferred. How many hours does it take to move the remaining bricks?
9. Twenty-four trucks can transport 192 tons of goods at a time. Now, how many tons can the same truck transport at a time?
10, Master Zhang plans to process 552 parts. 345 parts were processed in the first five days. According to this calculation, how many days will it take to process this batch of parts?
1 1, 3 The mill can process 2 184 kg of wheat in 4 hours. According to this calculation, how many kilograms of wheat can five mills process in six hours?
12, four machine tools in a machinery factory can produce 720 parts in five hours. According to this calculation, how many hours will it take to add six identical machine tools to produce 3600 parts?
13, a road maintenance team plans to build a 126-meter road, which was originally planned to be completed by 7 workers in 6 days. Later, the task of 54 meters was added, which required 6 days to complete. If every worker has a certain amount of work every day, how many workers will be needed to finish the work on time?
14, Jiuhu Central Primary School bought a batch of chalk. It was originally planned that 25 classes could take 40 days. It actually took 10 days, and 10 class was out. How many days is there left of chalk for school?
15, yangdong power plant has coal 10200 tons. In the first ten days, it burned 300 tons of coal every day. Later, it improved the stove and burned 240 tons of coal every day. How many days can this pile of coal burn?
16. The master and the apprentice started to process 200 parts at the same time, and the master processed 25 parts per hour. When completing the task, the apprentice has to work for 2 hours to complete the task. How many do apprentices process per hour?
17. The distance between Party A and Party B is 200 kilometers. It takes 5 hours by car and 40 hours on foot. Mr. Zech starts from A and takes the bus after 8 hours' walk. How many hours does it take to get to B?
18, Xu Ting Road Construction Team built a 4200m-long highway. It was originally planned to build 4m per person per day, and 2 1 person was sent to complete it. Four people were added to the actual construction, so it can be completed a few days in advance.
19, Shu Kei bicycle factory plans to produce 100 bicycles per day, which can complete the task on schedule. In fact, 120 bicycles were produced in one day, and the task was completed eight days ahead of schedule. How many bicycles are there in this batch?
Todd planned to finish some calculation problems in 30 days, but in fact, he calculated 80 more problems every day than originally planned. As a result, the task was completed in 25 days. How many problems are there in these calculations?
Fourth grade sum and difference problem
1. 1. There are 50 volleyball and football in the school, four more than football. How many volleyball and football are there?
2. There are 260 workers in Workshop A and Workshop B. Workshop A has 30 fewer workers than Workshop B. How many workers are there in Workshop A and Workshop B respectively?
3. Two engineering teams, Party A and Party B, jointly dug a canal with a length of 48km. Team A dug 6 kilometers more than Team B. How many kilometers did each team dig?
Xiao Ning and Xiao Fang are both 28 years old this year. Xiao Ning is two years younger than Xiao Fang. How old is Xiao Fang this year?
The average age of Xiao Min and his father is 29, and his father is 26 years older than him. How old are Xiao Min and his father?
6. In Xiaolan's final exam, the average score of Chinese and mathematics was 96, and mathematics was 4 points more than Chinese. How many points did Xiaolan get in Chinese and Mathematics?
2.1.There are 480 books on the shelves A and B. If you take 40 books from the shelf A and put them in the shelf B, the number of books on the two shelves is exactly the same. How many books are there on the shelves A and B?
There are 30 kilograms of water in two buckets. If you pour 6 kilograms of water from the first bucket into the second bucket, there is as much water in the two buckets. How many kilograms of water are there in each bucket?
Warehouse a and warehouse b store 58 tons of rice. If 3 tons of rice is transferred from warehouse A to warehouse B, the rice stored in the two warehouses is exactly the same. How many tons of rice are stored in warehouse A and warehouse B respectively?
4. Party A and Party B each * * 150 yuan. If Party A increases 13 yuan and Party B decreases 27 yuan, their amounts will be equal. How many are A and B?
Three, 1, A and B two piles of goods *** 180 tons, did A pile of goods transport 30 tons or more than B pile of goods 12 tons, and how many tons do the two piles of goods need?
2. Two piles of goods A and B *** 180 tons. If 30 tons of goods are transported from place A to place B, the goods in place A are still more than those in place B 10 tons. How many tons are there in each pile?
3. There are 64 kilograms of apples in Basket A and Basket B. Take out 5 kilograms from Basket A and put them in Basket B. As a result, the apples in Basket A are 2 kilograms less than those in Basket B. How many kilograms of apples are there in Basket A and Basket B?
4. There are 2008 students in two schools, A and B. If school A transfers 20 students and school B transfers 15 students, school A has 5 more students than school B. How many students are there in each school?
There are three kinds of vegetables in the school canteen, among which cucumbers and tomatoes weigh 50 kilograms, vegetables and cucumbers weigh 70 kilograms and vegetables and tomatoes weigh 60 kilograms. How many kilograms are there in each of these three vegetables?
6. A Dream of Red Mansions is divided into three volumes, namely, upper, middle and lower volumes. The whole book *** 108 yuan. The first volume is more expensive 1 1 yuan than the middle volume, and the second volume is cheaper than the middle volume, 5 yuan. How much are the first, middle and second volumes?
7. The sum of four people's ages is 77 years old, and the youngest is 10 years old. The combined age of him and the oldest person is seven years older than the combined age of the other two. What's the oldest age?
8. Xiao Nuo ran five times along the swimming pool with a difference of 30 meters in length and width, doing preparatory activities before launching. It is known that Xiaonuo ran 700 meters. Q: What is the length and width of the swimming pool?
9. Ceng Laoshi weighs 30 kilograms more than Han Qi, Ceng Laoshi weighs 25 kilograms more than Chen He, Han Qi Chen He weighs 75 kilograms, and Han Qi Michael Chen each weighs how many kilograms?
10, there are many flower seedlings in the nursery, 1 1000 is not a rose, 12500 is not a peony, there are 8500 roses and peonies, how many roses and peonies are there?
Fourth grade and doubling problem
1, Xiaohong and her mother add up to 40 years old, and her mother is four times as old as Xiaohong. How old are Xiaohong and her mother?
2. The sum of numbers A and B is 150, and the quotient of number A divided by number B is 4. What are the numbers A and B respectively?
The length of a rectangular board is twice the width, and the circumference is 54 cm. What is the area of this rectangular block of wood?
4. A basket of apples, a basket of pears and a basket of grapes weigh 42kg. I know that apples weigh twice as much as grapes, and pears weigh three times as much as grapes. How many kilograms are apples, pears and grapes?
Three classes planted 200 trees in Grade Three, and the trees planted in Class Two were twice as many as those planted in Class One. There are as many trees planted in Class Three as in Class Two. How many trees have been planted in three classes?
6. There are three piles of coal. The pile A is three times as big as the pile B, the pile C is twice as big as the pile A, and the three piles of coal weigh 240 kilograms. How many kilograms do piles A, B and C weigh respectively?
7. There are three road teams working together to build a 240-kilometer-long road. Team a is three times as big as team b and team c is twice as big as team a, so how many kilometers will team a, team b and team c build?
8. Teacher Zhang bought back 83 basketball and football balls, of which basketball is twice as big as football. How many balls are there?
9. Teacher Zhang bought back 83 balls of basketball, football and volleyball, of which basketball is twice as big as football and volleyball is twice as big as football. How many balls are there?
10, Teacher Zhang bought 83 balls of basketball, football and volleyball, of which basketball is twice as big as football, and football has five more balls than volleyball. How many of these three kinds of balls are there?
1 1, 30 for Xiaohua and 0/5 for Xiaoming. After asking Xiao Ming how many to give Xiaohua, Xiaohua's pen is 8 times that of Xiao Ming.
12, Xiaoming has 18 books, Xiaofang has 8 books, and now he has bought 16 books. How to distribute them so that Xiao Ming's books are twice as big as Xiao Fang's?
13. There are 60 tons of water in Pool A and 30 tons of water in Pool B. If the water in Pool A flows into Pool B at a rate of 3 tons per minute, how many minutes later, the water in Pool B is twice as much as that in Pool A?
14, a division formula, the quotient is 18, the remainder is 4, the sum of dividend, divisor, quotient and remainder is 292, what are the divisor and dividend respectively?
Differences in the fourth grade
1, Linxia primary school bought three times as much volleyball as basketball, and volleyball was more than basketball 18. How many volleyball and basketball did you buy? How many volleyball and basketball did you buy?
There are two bookshelves, the big one and the small one. There are four times as many books on the big shelf as on the small shelf. If you take out 150 books from the big shelf and put them on the small shelf, the number of books on the two shelves is equal. How many books are there in each bookcase?
3. Old cats and kittens go fishing. This old cat catches three times as much as a kitten. If the old cat gives the kitten three, the kitten is two less than the old cat. How many fish do two cats catch?
Teacher Zhang bought back 83 more basketball balls than football, among which basketball is twice as many as football with 5 more balls. How many of these two kinds of balls are there?
5. The kilograms of white sugar in the grocery store are 35 kilograms less than those of brown sugar, and it is known that white sugar is 4 1 kg more than brown sugar. How many kilograms of white sugar and brown sugar are there in the grocery store?
6. Teacher Zhang bought basketball, football and volleyball, among which football is three times as much as basketball, football is seven times more than volleyball, and volleyball is more than basketball 1 1. How many balls do these three kinds have?
7. Pears are 2000 kilograms heavier than grapes, apples are twice as heavy as grapes, and apples are 3000 kilograms heavier than pears. How many kilograms are apples, pears and grapes?
8. Xiaoming's deposit is three times that of Xiaogang. Now Xiaoming takes out 380 yuan and Xiaogang takes out 1 10 yuan, and the deposit amounts of the two people become the same. How much did Xiaoming and Xiaogang save?
9. The tonnage of grain stored in warehouse A is three times that of warehouse B. If 60 tons are taken from warehouse A and 80 tons are brought from warehouse B, the tonnage of grain stored in two granaries A and B is exactly the same. How many tons of grain are stored in granaries A and B respectively?
10, two granaries, A and B, each store several tons of grain, and the grain stored in warehouse A is three times that of warehouse B. If warehouse A transports 60 tons and warehouse B transports 260 tons, then the tons of grain stored in two granaries A and B are equal. How many tons of grain are stored in granaries A and B respectively?
1 1. Xiao Zhang has 36 extra-curricular books and Xiao Xu has 24 extra-curricular books. After they donated the same number of books, Xiao Zhang left three times as many books as Xiao Xu. How many books did they each donate?
12, master and apprentice process the same batch of parts, master processes 102 pieces, and apprentice processes 40 pieces. At this time, the number of apprentices left behind is three times that of the master. How many parts do master and apprentice have to process?
Solve a problem with a hypothetical method
Number of rabbits = (total number of feet-number of feet per chicken × number of chickens and rabbits) ÷ (number of feet per rabbit-number of feet per chicken)
Number of chickens = total number of chickens and rabbits-number of rabbits (assuming chickens, find rabbits first)
Or: number of chickens = (number of feet per rabbit × total number of chickens and rabbits-total number of feet) ÷ (number of feet per rabbit-number of feet per chicken)
Number of rabbits = total number of chickens and rabbits-number of chickens (assuming rabbits, find chickens first)
1, 30 chickens and rabbits, 70 feet, how many chickens and rabbits are there?
There are 20 chickens and rabbits and 50 feet. How many chickens and rabbits are there?
In a parking lot, 48 cars and motorcycles were parked, including 4 wheels for each car and 3 wheels for each motorcycle. These cars have 65,438+072 wheels. How many cars and motorcycles are there in the parking lot?
4. The PE teacher bought ***2 1 sportswear jacket and trousers, and * * * spent 439 yuan, of which the jacket and trousers were each 19 yuan. How many shirts and trousers did the teacher buy?
1, buy two kinds of theater tickets, one for 6 yuan, one for 4 yuan, two kinds of tickets 1 1, and one for 50 yuan. How many tickets did you buy?
2. In Yangdong, there are ***30 banknotes with face value from 2 yuan to 5 yuan, 1 banknote with face value from 90 yuan. How many bills are there from 2 yuan to 5 yuan?
3. There are 20 RMB with 20 cents, 50 cents and 1 yuan, and * * is 12 yuan, so 1 yuan has _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
1, a batch of cement, loaded with cars, loaded with 20 cars, as long as 12 cars, each car is loaded with 4 tons more. How many tons is this batch of cement?
2, a pile of cement, loaded with small trucks, with 30 cars, loaded with big trucks, as long as 24 cars, each big truck is loaded with 5 tons more than the small truck. How many tons is this batch of cement?
1. A company transports 400 boxes of shirts, and the freight per box is stipulated in 30 yuan. If you lose a box, you will not only lose the freight, but also compensate 100 yuan. After delivery, the freight will be settled at 8880 yuan. How many boxes were lost in this transportation?
In an English contest in a primary school, he got 10 for every question he answered correctly. If he didn't do or answered a question wrong, he got 2 points. * * * got 15, and Xiao Ming got 102. How many questions did he answer correctly?
3. Jiuhu Primary School held a math contest in the sixth grade, with 20 questions. If he does a right question, he gets 5 points, but if he doesn't do a right question or does something wrong, he gets 3 points. If Liu Gang got 60 points, how many questions did he get right?
4. Workers delivered 250 celadon vases, and agreed that one of them should be delivered to the destination to pay the freight to 20 yuan. If one of them is damaged, it will cost 100 yuan. After transporting these vases, the workers got 4400 yuan, but how much was damaged?
1. Chris Lee concert sold 600 tickets for 30 yuan, 40 yuan and 50 yuan, earning 23,400 yuan, of which the number of tickets for 40 yuan and 50 yuan was the same. How many tickets of each kind were sold?
2. Wang Shuqi sold ***200 tickets to 30 yuan, 40 yuan and 50 yuan, and earned 7800 yuan, of which 40 yuan and 50 yuan had equal tickets. How many tickets of each kind were sold?
Spiders have eight legs, dragonflies have six legs and two pairs of wings, and cicadas have six legs and 1 pairs of wings. At present, these three species have 16 bugs, * * * have 1 18 legs and 14 pairs of wings. Q: How many insects are there in each species?
2. The prices of the three exercise books A, B and C are 7, 3 and 2 points respectively. I sold 47 exercise books of three kinds and paid 2 1 yuan 2 cents. B bought twice as many exercise books as C. How many exercise books did you buy each of the three?
3. Buy some 4-cent and 8-cent stamps, 80 cents in 6 yuan. As we all know, there are 40 8-cent stamps more than 4-cent stamps, so how many stamps did you buy each?
4. One yuan, five yuan and ten yuan are RMB * *14, and * * is counted as 66 yuan, of which one yuan is two more than ten yuan. How much is each of the three kinds in RMB?
Relationship between profit and loss issues:
1, (surplus+deficit) ÷ Difference between two distributions = number of copies.
2. (big profit-small profit) ÷ Difference between two issues = number of copies
3, (big loss-small loss) ÷ Difference between two distributions = number of copies
Points per time × copies+surplus = total, points per time × copies-loss = total,
The key to solve the profit and loss problem problem is to find the total difference and quantity difference of two distributions, and then find the number of distributors and the number of goods by using the basic formula.
1. The kindergarten bought some toys. If each class is divided into 8 toys, there will be 2 more toys. If each category is divided into 10 toys, there will be 12 toys less. How many classes are there in kindergarten? How many toys are there in this batch?
Xiaoming took some money to buy apples. If he bought 3 kilograms, he would pay more for 2 yuan. If he bought 6 kilograms, he would be short of 4 yuan money. How much are apples per kilogram? How much money did Xiaoming bring?
A group of people went to the hillside to plant trees. If everyone plants four trees, there are still 12 trees left. If each race has planted eight trees, there are still four trees missing. How many people are there in this group? How many trees are there?
A group of students are moving books. If each student moves two books, there will be 12 books left. If each student moves four books, six books are still missing. How many students are there in this group? How many books are there in this batch?
1, the teacher bought some exercise books and distributed them to outstanding young pioneers. If each person is divided into five books, there will be more14; If each person is divided into seven books, there will be two more; How many outstanding young pioneers are there? How many exercise books did you buy?
2. Give the children a bag of candy. If each child is divided into 4 pieces, there will be an extra 12 pieces. If each child is divided into six pieces, there will be two more pieces. How many children are there? How many sweets are there?
Mother bought some apples and distributed them to the whole family. If everyone is divided into six parts, there will be 12 more apples. If everyone is divided into seven parts, there are still six apples. How many people are there in the family? How many apples did mom buy back?
4. Some students live in a school, each dormitory has 8 people, and there are 24 beds left. If each dormitory has 10 people, there are only two beds left. How many dormitories are there in the school? How many boarding students are there?
1. The school sent some students to move saplings. If everyone moves six trees, the difference is four. If each person moves eight trees, the difference is 18. How many students did the school send? How many saplings are there in this batch?
In science class, the teacher distributed leaves to the students. If each student is divided into five leaves, there are three leaves. If each student is divided into 7 leaves, there are 25 leaves. How many students are there in this class? How many leaves did the teacher bring?
3. Students in the math interest group do math problems. If each student does six questions, there are four less. If each student does 8 questions, it will be less 16. How many students are there? How many math problems are there?
4. School rehearsals. If there are 8 people in each row, there will be 2 people missing in that row. If there are 9 people in each row, then there are 7 people missing in one row. How many rows will there be in one row? A * * * How many people are there?
1 Class 3 (1) students go boating in the park. If there are four people on each boat, there will be four more. If each ship takes 6 people, there will be 4 more ships; How many boats are there in the park? How many students are there in Class Three (1)?
2. The school allocates dormitories to new students. If there are eight people in each room, there are two rooms missing. If there are 10 people in each room, two rooms are extra. How many rooms are allocated to freshmen? How many freshmen are staying?
3. Students go boating. If there are five people in each boat, then 10 people have no boat. If there are two more people on each boat, there will be two more boats. How many ships are there? How many students are there?
If Xiaoming walks 40 meters every minute from home to school, he will be 2 minutes late; If he walks 50 meters every minute, he will arrive four minutes early. How far is Xiaoming's home from school?
1, the exercise book for junior three students, if each student sends 5 copies, there are still 32 copies left, if each student of 10 sends 4 copies and the rest sends 8 copies, it is just finished. So how many students are there in grade three? How many exercise books are there?
Xiaoming bought an interesting math book. He planned that if he did three questions every day, there would be 16 questions left. If he does five questions every day, he will only do 1 on the last day. So how many problems does this book have? How many days does Xiaoming plan to do it?
Students in Class 3 (2) go to plant trees. If they plant five trees each, there are still three left unattended. If four of them plant four trees and the rest plant six trees, all the trees will be planted. So how many students took part in tree planting activities? How many trees have been planted?
Xiao Ming looked at his watch when he came home from school and found that if he walked 80 meters per minute, he would be 5 minutes late. If he walks 10 minutes first, and then rides his bike 200 meters per minute, he will arrive at school 1 minute earlier. How many minutes did Xiao Ming leave home for school?