Two sides paint

The door has the shape of a rectangle with dimensions of 260cm and 170cm. How many cans of paint will be needed to paint this door if one can of paint cover 2m² of the area? We paint the doors on both sides.

Correct answer:

n =  5

Step-by-step explanation:

$$\begin{gathered} a=260\text{ cm}\to \text{ m}=260\mathrm{/}100\text{ m}=2.6\text{ m } \\ b=170\text{ cm}\to \text{ m}=170\mathrm{/}100\text{ m}=1.7\text{ m } \\ {S}_1=a\cdot b=2.6\cdot 1.7={\displaystyle \frac{221}{50}}=4\frac{21}{50}=4.42{\text{m}}^2 \\ {S}_2=2\cdot S_1=2\cdot 4.42={\displaystyle \frac{221}{25}}=8\frac{21}{25}=8.84{\text{m}}^2 \\ {S}_3=2{\text{m}}^2 \\ n=\lceil S_2\mathrm{/}{S}_3\rceil =\lceil 8.84\mathrm{/}2\rceil =5 \end{gathered}$$

Try another example

Related math problems and questions:

• Insulate house
  The property owner wants to insulate his house. The house has these dimensions 12, and 12 m is 15 m high. The windows have 6 with dimensions 170 and 150 cm. Entrance doors are 250 and 170 cm in size. How many square meters of polystyrene does he need?
• Squares
  Calculate the area of square and result round to square decimeters. a) a = 1,52 dm b) a = 13 268mm c) a = 562 cm d) a = 1,52 m
• Seeds
  The field has a rectangular shape with dimensions of 128 m and 350 m. How many kg of seed are needed for sowing if the 1 m² will consume 25 g of seeds?
• Windows
  Calculate the masonry area to build a wall with dimensions of 9 m × 4 m with 4 windows of size 64 cm × 64 cm.
• Room dimensions
  Room dimensions are 5m and 3.5m. Room height is 2.85m. Paint the room (even with the ceiling). There will be 2 layers. Doors and windows have a total of 2.5 m². One box of paint is enough for 6m². How many boxes of paint are needed? How much do we pay if
• The room
  The room has a cuboid shape with dimensions: length 50m and width 60dm and height 300cm. Calculate how much this room will cost paint (a floor is not painted) if the window and door area is 15% of the total area and 1m² cost 15 euro.
• Tablecloths
  The restaurant has sixty-two square tablecloths with a side length of 150 cm and 36 rectangular tablecloths with dimensions of 140 cm and 160 cm. A) How many meters of hemming ribbon will be needed if we add 50 cm to each tablecloth? B) The ribbon sale in
• Two walls
  Calculate the surface area of a cube in m² if you know that the area of its two walls is 72 dm².
• Paint cans
  How many paint cans do we need to paint the floor in two rooms with dimensions of 6.8m x 4.5m and 6m x3.8m? One can are for 6m².
• Office rent
  For rent 1m² of office space is paid €165 per year. How much is the annual rent for an office as big as a football field with dimensions 71.5 m and 102.5 m?
• Playground
  The land for the school playground's construction has the shape of a rectangle with a shorter side of 370 m. Its other side is 260 m longer. How many meters of the fence does the school need to buy on the fencing playground?
• The Scout Tent
  The Scout Tent has a rectangular wooden underlay with dimensions of 220 cm and 150 cm. How much canvas is needed for a 170 cm high pyramid roof?
• Painter 3
  Dad want to paint wall high 250 cm wide and 230 cm with wallpaper. How many meters must buy wallpaper if wallpaper width is 60 cm?
• Paula
  Paula is painting six doors that are all the same size. She used 2 liters of paint to cover 1 3/5 doors. How many liters of paint are needed for 1 door?
• Tiles
  Hall has dimensions 325 &time; 170 dm. What is the largest size of square tiles that can be entire hall tiled, and how many we need them?
• Tiles
  How many 46 cm square tiles will cover a floor 22.08 m by 8.74 m?
• Fence of the garden
  The garden has dimensions of 5m and 400cm. How many meters meshes are needed for fencing the plot?