2. Add 3 to a number, multiply 3, subtract 3, and finally divide it by 3, and the result is still 3. Find this number.
3. Multiply a number by 4 times 6, subtract 10, and multiply by 2 to get 88. Find this number.
4, subtract 3 times from a number, and then subtract 2 times to get 80. Find this number.
Exercise 2:
1, A, B and C each have some comic books. After A gives B 3 books and B gives C 5 books, the number of books for three people is the same. How many copies was B originally more than C?
Xiaoming, Xiaohong and Xiao Qiang each have some glass balls. If Xiaoming gives Xiaohong 10 and Xiaohong gives Xiao Qiang 6, the number of three people is the same. How much is Xiaohong more than Xiao Qiang?
Group A, Group B and Group C each have some books. If Group A lends Group B 13 books and Group B gives Group C 6 books, then the number of books in the three groups is the same. Which group has more books, Group B or Group C? How many copies are left?
4. Three children, A, B and C, each has some calendar cards. If a gives B 13, b gives C 23 and c gives A 3, then each of them has 30. How many calendar cards did three people have?
Exercise 3:
1. Li Nainai sells eggs. In the morning, she sold more than half of the total 10 eggs. In the afternoon, she sold more than half of the remaining 10 eggs, leaving 65 eggs unsold. How many eggs are there in Li Nainai?
There are some plums in the bamboo basket. Give half to the first person, then give the remaining half and two to the second person, leaving six plums. How many plums are there in the bamboo basket?
3. Uncle Wang has a salary of several dollars, from which he takes out more than half of 10 and deposits it in the bank, and the remaining half takes out five dollars to buy oil, salt, sauce and vinegar, and the remaining 80 dollars. How much is Uncle Wang's salary?
Mom bought some oranges. Xiao Ming ate more than half on the first day, and the remaining half ate less than two the next day, leaving five. How many oranges did mom buy?
Exercise 4:
1, Xiaohong, Xiaoming and Xiao Ning all like pictures. If Xiaohong gives Xiaoming 1 1 pictures, Xiaoming gives Xiao Ning 20 pictures, and Xiao Ning gives Xiaohong 5 pictures, then the three of them have the same number of pictures. It is known that the three of them have 150 pictures, and the three of them.
2. Three baskets of apples * * * 90kg. If you take 15kg from the first basket and put it in the second basket, 20kg from the second basket and 17kg from the third basket and put it in the first basket, the three baskets are as heavy as apples. How many kilograms of apples are there in baskets A, B and C?
3. Three classes in Grade Three 156 students. If you transfer 5 students from Class 3 (1) to Class 3 (2), 8 students from Class 3 (3) and 4 students from Class 3 (1). How many people are there in each of the three classes?
Xiao Lin, Xiao Fang, Xiao Jun and Xiao Min all like reading. If Kobayashi gives Xiaofang 10, Xiaofang gives Xiaojun 12, Xiaojun gives Xiao Min 20, and Xiao Min gives Kobayashi 14, the number of books for four people will be the same. It is known that they have 165438. How many books do the four of them have?
Exercise 5:
1, two people were carrying 60 books together. Xiaoming took some first, and Xiaohong took half when he saw that he took too much. Xiaoming refused and Xiaohong gave him 10 books. At this time, Xiao Ming has four more than Xiao Hong. How many copies did Xiaoming take at first?
The two brothers scrambled to pick 26 bricks, and the younger brother scrambled to install some. When my brother saw that his brother picked too many bricks, he took half of them. The younger brother refused to accept it, and the older brother returned five bricks to his younger brother. At this time, the two are almost the same. How many pieces was my brother going to choose at first?
There are 28 sparrows in two trees. Half of them flew from the first tree to the second tree, and the other three flew from the second tree to the first tree. At this time, the second tree has six more sparrows than the first tree. How many sparrows are there on the first tree?
4.a and B each have several kilograms of water. If as much water as B is poured from one barrel and put into B barrel, then as much water as A barrel is poured from B barrel and put into A barrel, then two barrels of water are exactly 24 kilograms. How many kilograms are there in two barrels of water?
1, 30 chickens and rabbits, 84 feet, how many chickens and rabbits are there?
2. There are *** 100 chickens and rabbits, and * * * has 280 feet. How many chickens and rabbits are there?
There are 50 chickens and rabbits. Rabbit's feet are 40 less than chicken's. How many chickens and rabbits are there?
There are 45 chickens and rabbits. A chicken has 60 more feet than a rabbit. How many chickens and rabbits are there?
Exercise 2:
1, chickens and rabbits live in the same cage. There are 30 more chickens than rabbits, and one * * * has 168 feet. How many chickens and rabbits are there?
2. Chickens and rabbits live in the same cage. Chickens have 25 more than rabbits, and one * * * has 170 feet. How many chickens and rabbits are there?
3. Buy two kinds of theater tickets, one for 4 yuan, one for 3 yuan and nine for 97 yuan. How many tickets did you buy?
4.* * * Chickens and rabbits with 48 feet. If you change the number of chickens into the number of rabbits, * * * has 42 feet. How many chickens and rabbits are there?
Exercise 3:
1. A school held a math contest. Every time he does a right question, he gets 9 points, and every time he does a wrong question, he gets 3 points. * * * There are 12 questions, and Xiao Ming scored 84 points. How many questions did he make wrong?
2. In an English contest in a primary school, he got 10 for every question he answered correctly, and 2 for every question he answered incorrectly. * * * got 15, and Xiao Ming got 102. How many questions did he answer correctly?
3. A company transports 400 boxes of shirts, and stipulates that the freight for each box is 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?
4. A workshop produces a batch of ***250 pieces of clothes, and one piece can be taken to 25 yuan. If one piece does not meet the requirements, 20 yuan will be deducted, and the cost after production will be 5350 yuan. How many pieces are unqualified?
Exercise 4:
1, the number of pieces of fruit candy is three times that of chocolate candy. If Xiaoming eats 2 pieces of fruit candy every day, 1 piece of chocolate candy, there will be 7 pieces of fruit candy left in a few days, and the chocolate candy will just be finished. How many pieces of fruit candy are there?
Xiaoming's family has some pears and apples. There are three times as many apples as pears. Dad and Xiaoming each eat 1 apple and mom eats 1 pear every day. A few days later, there were nine apples and pears left. How many apples are there?
There are some red balloons and yellow balloons in the shop. The number of red balloons is only four times that of yellow balloons. Two red balloons and 1 yellow balloons are sold every day. A few days later, there were 12 yellow balloons left in the red balloon, and the yellow balloons were just sold out. How many people are there in Red Baron?
There are several boxes of colored chalk and white chalk in Class 4 (3). The number of boxes of white chalk is seven times that of colored chalk. Use two boxes of white chalk and 1 box of colored chalk every day. When all the colored chalk is used up, there is still 10 box of white chalk left. How many boxes of white chalk are there?
Exercise 5:
1. The school bought 8 desks and 6 chairs and spent 1650 yuan. The price of each table is twice that of each chair. How much is each desk and chair?
It costs 252 yuan to buy 4 tables and 9 chairs. 1 table 3 chairs are exactly the same price. What is the unit price of each set of tables and chairs?
3. The school bought four basketballs and five volleyballs and spent 185 yuan. It is known that a basketball is more expensive than a volleyball, so what is the unit price of basketball and volleyball?
Xiaoming bought two ping-pong balls and four rubber balls to go to 52 yuan. The price of 6 ping-pong balls is equivalent to 1 rubber ball. What is the unit price of table tennis and rubber balls? 1. It takes 40 days for Party A to complete a project alone, 30 days for Party B and 24 days for Party C to complete it alone. After three days of cooperation between Party A and Party C, Party B and Party C left for a few days for business reasons, and the number of days that Party B left was three days longer than that of Party C. As a result, it took 14 to complete. How many days does B and C leave each?
If the store sells the goods at 10% off the list price, it can get 20% profit. If the purchase price of goods is 2 1 yuan per piece, what is the price tag of each piece?
1. A cuboid bunker is 4m long, 2m wide and 0.5m deep. If the yellow sand weighs 1.4 tons per cubic meter, how many tons does it weigh?
2. It is known that a rectangular tin tank with a length of 18 decimeter and a width of 10 decimeter can hold 1620 liters of water. How deep is this tank?
3. A cuboid plastic box with medicine, 0.6m long, 0.25m wide and 0.5m deep. If you put the whole box of medicine into a small bottle with a capacity of 400ml each, how many bottles should this box contain at least?
4. A cubic billet is 6 cm long and forged into rectangular steel with a cross section of 3 cm long. How many meters is steel?
5. A cuboid oil drum with a bottom area of 18 square decimeter can hold 43.2 kilograms of oil. If the weight of each liter of oil is 0.8 kg, what is the height of the oil drum?
6. In a glass jar with a length of 25cm and a width of 20cm, there is a cubic iron block with a length of10cm. At this time, the water depth is 15 cm. If this iron block is taken out of the jar, how many centimeters is the water depth in the jar?
7. A cuboid fuel tank with a square bottom and a side length of 6 decimeters measured from the inside. It contains 144 liters of oil. As we all know, the depth of the oil inside is half that of the oil tank. How many decimetres is this oil tank?
8. One room 1200 wooden floor, 40 cm long, 20 cm wide and 2 cm thick. How many square meters is this room? How many cubic meters of wood does it take to spread out this room?
9. A section of rectangular steel, with a length of1.6m and a cross section of 4cm square. It weighs only 7.8 grams per cubic centimeter. How much does this square steel weigh?
10. Make an uncovered cuboid oil drum with iron sheet. The length and width are 4 decimeters and the height is 6 decimeters. How many square decimetres is the iron sheet? Put gasoline in a barrel, and each liter of oil weighs 0.82 kg. How many kilograms of gasoline can this barrel hold?
1 1. Forge a cubic billet with a length of 0.6 meters into rectangular steel with a cross section of 0.09 square meters. How long is forged steel? (Equation solving)
12, a cuboid glass tank, measuring 40 cm long and 25 cm wide from the inside, and the water depth in the tank is 12 cm. After a stone is immersed in water, the water surface rises to 16 cm, and the volume of the stone is found.
13. Make 12 cuboid iron chimneys, each section is 2m long, 4m wide and 3m high. How many square meters of iron do you need at least?
14. The floor of Xiao Min's room is rectangular. It is 5 meters long and 3 meters wide, and has a 2 cm thick wooden floor. How many cubic meters of wood do you need at least?
15, a coal truck, viewed from the inside, is 2.5m long and1.8m wide, and the loaded coal is 0.6m high, with an average weight of1.5t per cubic meter. How many tons of coal does this truck carry?
16. rectangular iron drum without cover, with square bottom, 4m side length and 1m height. How much iron does it take to make such a barrel? How many liters of water can this barrel hold?
17. The stadium is paved with 37.5 cubic meters of cinder on a straight runway with a length of 100 meter and a width of 7.5 meters. How thick can cinder be spread?
18, rectangular children's swimming pool, 40m long,14m wide and1.2m deep. How many square bricks with an area of 16 square decimeter should be pasted on the wall and bottom of the pool now?
19, cuboid container, bottom area 16 square decimeter, water height 6 decimeter. Now put an iron block with a volume of 24 cubic decimeters. How high is the water surface at this time?
20. Stack 2 100 cubes with a side length of 1 cm into a cuboid. Its height is 10 cm, and its length and width are greater than its height. What is the circumference of its bottom?
2 1, rectangular iron sheet, 32 cm long, cut a square with a length of 4 cm at its four corners, then fold it and weld it into a rectangular iron sheet box without a cover. It is known that the volume of this iron box is 768 cubic centimeters. What is the area of this iron?
22. The area of a rectangle is 24 cm, and its length and width are all whole centimeters. How many kinds of rectangles are there?
23. Class 5 (1) has no more than 50 students. When studying in groups, according to the different teaching contents, they can be divided into 3 people in each group, 4 people in each group, 6 people in each group and 8 people in each group. All kinds of points are just finished. There may be () students in this class or () students.
24. Party A, Party B and Party C borrow books from the library. Party A comes every six days, Party B comes every eight days and Party C comes every nine days. If we meet in the library on March 5, when will we go to the library next time?
25. Gardeners planted a tree every 4 meters on both sides of a highway, and planted 74 trees in a row. Now it's time to plant a tree every 6 meters. So, how many trees don't need transplanting?
26. Uncle Zhang sold fruit all day. When he counted the money at night, he found that all the bills in his hand were twenty-five dollars. Zhang divided the pile of money into two piles with equal amounts. In the first pile, the amount of five yuan and two yuan is equal, and in the second pile, the number of five yuan and two yuan is equal. Do you know how much money there is at least in this pile of money?
27. The fifth-grade students in bright primary school are divided into groups of 786, all of whom have just finished their studies. How many students are there in Grade Five?
1, a number MINUS 24 plus 15, and then multiplied by 8, you get 432. Find this number.
2. Add 3 to a number, multiply 3, subtract 3, and finally divide it by 3, and the result is still 3. Find this number.
3. Multiply a number by 4 times 6, subtract 10, and multiply by 2 to get 88. Find this number.
4, subtract 3 times from a number, and then subtract 2 times to get 80. Find this number.
Exercise 2:
1, A, B and C each have some comic books. After A gives B 3 books and B gives C 5 books, the number of books for three people is the same. How many copies was B originally more than C?
Xiaoming, Xiaohong and Xiao Qiang each have some glass balls. If Xiaoming gives Xiaohong 10 and Xiaohong gives Xiao Qiang 6, the number of three people is the same. How much is Xiaohong more than Xiao Qiang?
Group A, Group B and Group C each have some books. If Group A lends Group B 13 books and Group B gives Group C 6 books, then the number of books in the three groups is the same. Which group has more books, Group B or Group C? How many copies are left?
4. Three children, A, B and C, each has some calendar cards. If a gives B 13, b gives C 23 and c gives A 3, then each of them has 30. How many calendar cards did three people have?
Exercise 3:
1. Li Nainai sells eggs. In the morning, she sold more than half of the total 10 eggs. In the afternoon, she sold more than half of the remaining 10 eggs, leaving 65 eggs unsold. How many eggs are there in Li Nainai?
There are some plums in the bamboo basket. Give half to the first person, then give the remaining half and two to the second person, leaving six plums. How many plums are there in the bamboo basket?
3. Uncle Wang has a salary of several dollars, from which he takes out more than half of 10 and deposits it in the bank, and the remaining half takes out five dollars to buy oil, salt, sauce and vinegar, and the remaining 80 dollars. How much is Uncle Wang's salary?
Mom bought some oranges. Xiao Ming ate more than half on the first day, and the remaining half ate less than two the next day, leaving five. How many oranges did mom buy?
Exercise 4:
1, Xiaohong, Xiaoming and Xiao Ning all like pictures. If Xiaohong gives Xiaoming 1 1 pictures, Xiaoming gives Xiao Ning 20 pictures, and Xiao Ning gives Xiaohong 5 pictures, then the three of them have the same number of pictures. It is known that the three of them have 150 pictures, and the three of them.
2. Three baskets of apples * * * 90kg. If you take 15kg from the first basket and put it in the second basket, 20kg from the second basket and 17kg from the third basket and put it in the first basket, the three baskets are as heavy as apples. How many kilograms of apples are there in baskets A, B and C?
3. Three classes in Grade Three 156 students. If you transfer 5 students from Class 3 (1) to Class 3 (2), 8 students from Class 3 (3) and 4 students from Class 3 (1). How many people are there in each of the three classes?
Xiao Lin, Xiao Fang, Xiao Jun and Xiao Min all like reading. If Kobayashi gives Xiaofang 10, Xiaofang gives Xiaojun 12, Xiaojun gives Xiao Min 20, and Xiao Min gives Kobayashi 14, the number of books for four people will be the same. It is known that they have 165438. How many books do the four of them have?
Exercise 5:
1, two people were carrying 60 books together. Xiaoming took some first, and Xiaohong took half when he saw that he took too much. Xiaoming refused and Xiaohong gave him 10 books. At this time, Xiao Ming has four more than Xiao Hong. How many copies did Xiaoming take at first?
The two brothers scrambled to pick 26 bricks, and the younger brother scrambled to install some. When my brother saw that his brother picked too many bricks, he took half of them. The younger brother refused to accept it, and the older brother returned five bricks to his younger brother. At this time, the two are almost the same. How many pieces was my brother going to choose at first?
There are 28 sparrows in two trees. Half of them flew from the first tree to the second tree, and the other three flew from the second tree to the first tree. At this time, the second tree has six more sparrows than the first tree. How many sparrows are there on the first tree?
4.a and B each have several kilograms of water. If as much water as B is poured from one barrel and put into B barrel, then as much water as A barrel is poured from B barrel and put into A barrel, then two barrels of water are exactly 24 kilograms. How many kilograms are there in two barrels of water?
1, 30 chickens and rabbits, 84 feet, how many chickens and rabbits are there?
2. There are *** 100 chickens and rabbits, and * * * has 280 feet. How many chickens and rabbits are there?
There are 50 chickens and rabbits. Rabbit's feet are 40 less than chicken's. How many chickens and rabbits are there?
There are 45 chickens and rabbits. A chicken has 60 more feet than a rabbit. How many chickens and rabbits are there?
Exercise 2:
1, chickens and rabbits live in the same cage. There are 30 more chickens than rabbits, and one * * * has 168 feet. How many chickens and rabbits are there?
2. Chickens and rabbits live in the same cage. Chickens have 25 more than rabbits, and one * * * has 170 feet. How many chickens and rabbits are there?
3. Buy two kinds of theater tickets, one for 4 yuan, one for 3 yuan and nine for 97 yuan. How many tickets did you buy?
4.* * * Chickens and rabbits with 48 feet. If you change the number of chickens into the number of rabbits, * * * has 42 feet. How many chickens and rabbits are there?
Exercise 3:
1. A school held a math contest. Every time he does a right question, he gets 9 points, and every time he does a wrong question, he gets 3 points. * * * There are 12 questions, and Xiao Ming scored 84 points. How many questions did he make wrong?
2. In an English contest in a primary school, he got 10 for every question he answered correctly, and 2 for every question he answered incorrectly. * * * got 15, and Xiao Ming got 102. How many questions did he answer correctly?
3. A company transports 400 boxes of shirts, and stipulates that the freight for each box is 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?
4. A workshop produces a batch of ***250 pieces of clothes, and one piece can be taken to 25 yuan. If one piece does not meet the requirements, 20 yuan will be deducted, and the cost after production will be 5350 yuan. How many pieces are unqualified?
Exercise 4:
1, the number of pieces of fruit candy is three times that of chocolate candy. If Xiaoming eats 2 pieces of fruit candy every day, 1 piece of chocolate candy, there will be 7 pieces of fruit candy left in a few days, and the chocolate candy will just be finished. How many pieces of fruit candy are there?
Xiaoming's family has some pears and apples. There are three times as many apples as pears. Dad and Xiaoming each eat 1 apple and mom eats 1 pear every day. A few days later, there were nine apples and pears left. How many apples are there?
There are some red balloons and yellow balloons in the shop. The number of red balloons is only four times that of yellow balloons. Two red balloons and 1 yellow balloons are sold every day. A few days later, there were 12 yellow balloons left in the red balloon, and the yellow balloons were just sold out. How many people are there in Red Baron?
There are several boxes of colored chalk and white chalk in Class 4 (3). The number of boxes of white chalk is seven times that of colored chalk. Use 2 boxes of white chalk every day, 1 box of colored chalk. When all the colored chalk is used up, there is still 10 box of white chalk left. How many boxes of white chalk are there?
Exercise 5:
1. The school bought 8 desks and 6 chairs and spent 1650 yuan. The price of each table is twice that of each chair. How much is each desk and chair?
It costs 252 yuan to buy 4 tables and 9 chairs. 1 table 3 chairs are exactly the same price. What is the unit price of each set of tables and chairs?
3. The school bought four basketballs and five volleyballs and spent 185 yuan. It is known that a basketball is more expensive than a volleyball, so what is the unit price of basketball and volleyball?
Xiaoming bought two ping-pong balls and four rubber balls to go to 52 yuan. The price of 6 ping-pong balls is equivalent to 1 rubber ball. What is the unit price of table tennis and rubber balls?