To paint one square meter of a wall, you need 2 kg of paint. Create an expression to calculate the amount of paint

To paint one square meter of a wall, you need 2 kg of paint. Create an expression to calculate the amount of paint (in kg) required to paint a wall measuring 4m 18m. How much paint is needed to paint the walls in a 12m 18m room if the ceiling height in the room is 4m?

For 1 m², 2 kg of paint is used, which means that to find how much paint will go to paint a wall measuring 4 m by 18 m, you need to find the area of ​​this wall. To do this, we multiply its dimensions:
4 * 18 = 72 (m²) – wall area.
To find how much paint will be spent on painting it, we multiply the amount of paint by 1 m² by the area:
2 * 72 = 144 (kg) – the paint will go to paint this wall.
To find how much paint will go to paint a room, you need to find the area of ​​the surface to be painted, for this you need to find the perimeter of the room and multiply it by the height of the walls:
P = (12 + 18) * 2 = 60 (m) – the perimeter of the room.
S = 60 * 4 = 240 (m²) – the surface area to be painted.
240 * 2 = 480 (kg) paint will be needed to paint the room.
Answer: 1) 144 kg; 2) 480 kg.