2. A room is 6 meters long, 3.5 meters wide and 3 meters high, with 8 square meters of doors and windows. Now, the walls and top of this room should be painted with cement. What is the area of cement painting? If you need 4 kilograms of cement per square meter, how many kilograms does a * * * need?
The length of a cube stone is 5 decimeters and the weight is 2.7 kilograms per cubic meter. How much does this stone weigh?
4. A box of biscuits is 20cm long, 15cm wide and 30cm high. Now, it should be surrounded by a trademark paper. What is the area of this trademark paper?
A rectangular stone, its cross-sectional area is 36 square decimeters and its length is 0.8 meters. If the stone of 1 cubic decimeter weighs 2.7 kilograms, how many kilograms does this stone weigh?
6. A cuboid medicine can hold 60 liters of medicine. It is known that the medicine pot is 5 centimetres long and 3 centimetres wide. What is its depth?
7. There is a cubic iron block with a side length of 80 cm. Now it is necessary to melt it into a cuboid with a cross-sectional area of 20 cm. What is the length of this cuboid?
8. Put two cubes 5 cm long together to form a cuboid. What is the surface area of this cuboid?
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 did the iron sheet use? 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. The bottom of a cuboid is a square with a side length of 10 decimeter and a height of 6 decimeters. What is the sum of the sides of this cuboid? What is the floor space? What is the surface area? What is the volume?
12. A cuboid glass tank, measured from the inside, is 40 cm long and 25 cm wide, 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. The distance between Party A and Party B is120km. It took someone five hours to get from A to B by bike, and it took four hours to speed up when he came back. How many kilometers per hour does he commute on average?
14. 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?
15. Put two cubes with a surface area of 24 square decimeters together to form a cuboid. What is the volume and surface area of this cuboid?
16. Cut the 4m-long steel bar into 6 sections on average. How long is each part? What percentage of the total length does the three sections account for?
17. It took Party A 12 hours, Party B 8 hours, and Party C 9 hours to complete a project .. Three people worked together for one hour, how much is left in the whole project?
18. Two cars * * * transport goods 10.5 tons. Car A transports twice as much goods as car B, with 4 tons less. How many tons do the two cars transport?
19. A rectangular glass jar, measured from the inside, is 5 decimeters long and 3 decimeters wide. Existing water depth 1.5 decimeter. When a stone is immersed in water, the water depth is 2 decimeters. What is the volume of this stone?
20. A room is 8 meters long, 6 meters wide and 2.5 meters high. If the walls around the room are covered with wallpaper, how many square meters of wallpaper do you need * * excluding the area of doors and windows of 10 square meters? 3.5 yuan, how much is the wallpaper per square meter?
2 1. There is a swimming pool with a length of 25m, a width of12m, a depth of1.4m, and a bottom and periphery of 2m. How many square white tiles do you need?
22. A cubic container with a length of 6dm is filled with water, and all the water in the container is poured into a rectangular sink. From the inside, the water tank is 6dm in length, 5dm in width and 8.5dm in height. How deep is the water filled in the water tank at this time? How many liters of water should I pour in to refill the tank?
23. In Yu Ying, there are 120 students in the senior grade, 130 students in the middle grade and 140 students in the lower grade. What percentage of the whole school is in the middle grade?
24. A cuboid iron box with a square bottom will get a square with a side length of 40 cm if one side of it is unfolded. What is the volume of this iron box?
25. The teacher made 40 small red flowers and distributed them to the first group, the second group and the rest to the third group. What percentage of total safflower did the third group get?
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