If a room is paved with 30 cm long square bricks, 800 pieces are needed. If a room is paved with 50 cm long square bricks, how many pieces are needed? The answer to proportional knowledge is mainly proportional knowledge

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• 1. The floor area of the room is fixed, what is the proportion between the side length of each brick and the number of bricks needed I'm in a hurry,
• 2. A house needs 360 pieces of square bricks with a side length of 4dm. If it is replaced with a side length of 3DM, how many pieces will it increase In a minute, please, or there will be no reward. Quick
• 3. Using a kind of square brick to pave the floor, there are 360 square bricks, which can pave 40 square meters. If 540 more square bricks are added, what proportion of the floor can we get
• 4. A classroom needs to be paved with square bricks. It needs 360 square bricks with an area of 0.16 square meters. If we use square bricks with a side length of 60 cm, how many do we need?
• 5. It takes 200 pieces to pave the floor of the study with 15cm long square bricks. How many pieces do you need to use 25cm long square bricks instead?
• 6. It takes 200 pieces to pave the classroom with 15 cm long square bricks. If you use 25 cm long square bricks to pave the classroom, how many bricks do you need?
• 7. It takes 200 pieces to pave the floor with 30 cm long square bricks on one side. If you use 20 cm long square bricks on the other side, how many pieces do you need
• 8. The school needs 500 square bricks with a side length of 2 mm, and how many square bricks with a side length of 4 DM?
• 9. The school is going to pave the floor tile for the 8-meter-long and 5.2-meter-wide classroom with 0.4-meter-long square bricks. How many square bricks do you need?
• 10. Xiaohong's family bought a new house and prepared to use a kind of floor tile to inlay the floor of the new house. It requires that the floor tiles are regular polygons, and each side length of each floor tile is equal, and each corner is also equal. There are five types of floor tiles in a decoration material market, and the degrees of each corner are 60 °, 90 °, 108 °, 120 ° and 135 ° respectively. What do you think are suitable for these floor tiles? Please state your reasons
• 11. It takes 500 pieces to use 15cm square bricks to pave the floor of a room. If we use 30cm square bricks to pave the floor, how many pieces?
• 12. The floor of a room needs 500 pieces of square bricks with a side length of 4 decimeters. If the floor is paved with square bricks with a side length of 5 decimeters, how many pieces do you need
• 13. It takes 1000 pieces to use 12 cm long square bricks to pave the floor of a room. If you use 18 cm long square bricks to pave the floor, how many pieces do you need? (keep the number in integer)
• 14. The room is 60 decimeters long and 45 decimeters wide. Now we plan to use square bricks to pave the floor. We need to use the largest square brick on the side (how many pieces can we just fill the floor of the room
• 15. If a room is paved with 30 cm long square bricks, 800 pieces are needed. If a room is paved with 50 cm long square bricks, how many pieces are needed? (solve by proportion)
• 16. If the same brick is used to pave the floor, 9600 pieces of square bricks with a side length of 0.3 decimeters are needed; if the square bricks with a side length of 0.4 decimeters are used, how many pieces are needed?
• 17. 140 tiles with an area of 36 square decimeters are just finished. How many tiles do you need if you switch to a 3-decimeter-long tile
• 18. A house, with an area of 18 square meters of brick floor, need 192. If the side length of 4 decimeters of brick, need how many?
• 19. A living room, if the area is 9 square decimeters of square paving need 144, if the area is 16 square decimeters of paving, how many?
• 20. A house, with an area of 36 square decimeters of square paving need 120 fast, if you switch to 4 decimeters of square brick paving, how many pieces do you need?