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Some of the same rooms need floor tiles Every day, 4 skilled fitters approve to decorate 5 rooms, but 3 square meters of floor is not decorated. Every day, 6 junior fitters install another 5 square meters of floor in addition to 7 rooms. It is known that a skilled fitter installs 3 square meters more than a junior fitter every day. How much floor area of this room should be decorated
Answer: set the decoration area of each room as X (5x-3) / 4 - (7x + 5) / 6 = 3
Solve this equation!
100 square meters of general house (2.8 meters high) of the total area of the interior wall? How to calculate the specific, there is a fixed formula?
It's usually three times the floor area of the room
A room is 4 meters long and 5 meters wide. It needs to be pasted with 300 by 450 internal wall tiles. How to calculate the area and how many internal wall tiles? Is there a calculation formula?
If you stick wall tiles, you can calculate the area of the wall. Just divide the wall area by the area of a wall tile, and you can get how many wall tiles you need
Wall area, is the length of the room (or width) times the height of the tile part
For example: the length of the room is 4 meters, assuming that the height of the tile is 2.5 meters, then the area of the wall is 4 × 2.5 = 10 (M2); the area of a tile is 0.3 × 0.45 = 0.135 (M2); then the number of tiles required on the wall is 10 △ 0.135 ≈ 74 (pieces). In addition, in actual use, due to the loss of tiles, it will generally increase the margin of about 5%
And stick to the floor tile, is to calculate the floor area. With the floor area divided by the area of a tile, is the number of tiles needed
Shop a room, with the side length of 3 decimeters of square bricks to 800, if use each area of 12 square decimeters of ceramic tiles, how many to use?
I am poor in mathematics, urgent!
Square brick with side length of 3 decimeters
Area of each block = 3 * 3 = 9 square decimeters
Total room area = 800 * 9 = 7200 square decimeters
So 7200 / 12 = 600
The school has built a new science and technology activity hall. Originally, it planned to use 5-decimeter-long square bricks to pave the floor. It needed 1600 such square bricks. Later, it changed to 8-decimeter-long square bricks,
How many square bricks are needed
The solution needs x blocks
8×8x=5×5×1600
64x=25×1600
x=625
The school plans to use square bricks to pave the floor. If the side length is 4 decimeters, 490 pieces are needed. If the side length is 7 decimeters, how many pieces are needed?
It's just a solution in proportion
It needs x bricks if the side length is 7 decimeters
x×（7×7）＝（4×4）×490
49x＝7840
x＝7840÷49
x＝160
A room to use side length of 3 decimeters of brick floor, need 96. Another room and the room area ratio is 4:5, such as
If this room is paved with 40 cm square bricks, how many do you need?
Another area = 3 × 3 × 96 △ 4 × 5 = 1080 square decimeters
40 cm = 4 decimeters
Square brick = 1080 ÷ (4 × 4) ≈ 68 pieces
A house is paved with square bricks. It needs 96 square bricks with a side length of 3 decimeters. How many square bricks need to be replaced by 2 decimeters? ．
Suppose x bricks with side length of 2 decimeters, 3 × 3 × 96 = 2 × 2 × X & nbsp; & nbsp; 9 × 96 = 4x & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 9 × 964 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 216 A: 216 bricks with side length of 2 decimeters
A house is paved with square bricks. It needs 112 square bricks with a side length of 3 decimeters. If it is changed to a side length of 2 decimeters, how many do you need? (use proportion to solve) urgent
The solution needs x blocks
3^2:2^2=x:112
9*112=4x
x=252
If a sidewalk is paved with 4-decimeter-long square bricks, 180 pieces are needed. If it is paved with 3-decimeter-long square bricks, how many pieces are needed?
4 × 4 × 180 (3 × 3) = 320 pieces
It costs 320 yuan
RELATED INFORMATIONS
- 1. Xiao Li's new home is 80 decimeters long floor tiles, laying the ground, need 200 fast, if you use an area of 1 square decimeter square tiles to shop, how many pieces do you need How many square meters is the house area of your family? Use proportion to solve the problem
- 2. Ask ceramic tile 800X800 to be equal to how many square?
- 3. The swimming pool is 50 meters long, 25 meters wide and 2 meters deep. How many tiles are needed to paste 4 square decimeters on its four walls and bottom?
- 4. The auditorium is 10 meters long, 10 meters wide and 3 meters high. It needs 80 yuan per square meter to paste 1.2 meters high bricks around the auditorium. How much is the total cost?
- 5. A room is 8.1m long and 5.2m wide. Now we need to lay 0.6m square floor tiles. Is 100 pieces enough? (regardless of loss.)
- 6. Use the same floor tiles to pave the floor. A room 8 meters long and 6 meters wide needs 1200 floor tiles. If you use a rectangular room 6 meters long, how many floor tiles do you need?
- 7. Xiaogang's bedroom floor is 4 meters long and 3.5 meters wide. It is paved with 0.25 square meters square bricks. How many square bricks do you need?
- 8. If a room is paved with 0.4m square bricks, it needs 270 pieces; if it is paved with 0.3m square bricks, how many pieces?
- 9. If Mr. Jiang's living room is decorated with 16 square decimeters of square bricks, it will take 150 pieces. Now, how many pieces of square bricks will it take to use 25 square decimeters of square bricks
- 10. A house needs 350 floor tiles with an area of 6 square decimeters to be paved with floor tiles. If the side length is 3 decimeters, how many floor tiles do you need at least?
- 11. There are 1760 pieces of red and white tiles, 60% of which are red and 514 pieces of which are white. There are as many tiles left. How many are the two kinds of tiles Fang Chengjie
- 12. There are 35 floors, 15 black tiles and 20 white tiles. If the floor area is 28 square meters, what are the areas of white tiles and black tiles
- 13. A cuboid has a length of 0.4 DM, a width of 0.3 DM, a height of 0.2 mm, a bottom area of () square decimeter, and a surface area of () square decimeter
- 14. The surface area of a 8dm long cylinder wood is reduced by 56.52dm2 after cutting a 3DM long cylinder wood along the bottom. Please calculate the remaining volume
- 15. There is a 9dm long cuboid wood which is sawed into two sections parallel to the bottom. The total surface area of the two sections is 3dm2 more than that of the original cuboid Find the volume of the original cuboid
- 16. A classroom is 12 meters long and 6 meters wide. How many pieces do you need if you use the floor tiles with a side length of 3 decimeters to lay the floor of the classroom?
- 17. Xiaodong's bedroom is 4.5 meters long and 2.5 meters wide. Use 0.5 meter square tiles to pave the floor. Are 50 such tiles enough?
- 18. The area of the school computer room is 85 square meters, with 60 cm square tiles on the side. Is 200 pieces enough?
- 19. The area of the conference room is 72 square meters. The floor is made of 800 identical square tiles
- 20. The side length of a square is two seventh of a meter. How many decimeters is its perimeter? How many square decimeters is its area?