Question

3. A bedroom wall is 3m long and 2m high. What is the total area of the wall? A can of paint will cover 10m². How many cans are needed if each wall needs 2 coats of paint?​

Answer 1

Total area of wall = 24 m² and the number of cans of paint required is 4.8 cans

How to solve

Given data

length = 3 m

width = 2 m

a can of paint will cover 10 m²

each wall needs 2 coats of paint

Area of a wall

= 3 * 2

= 6 m²

Assuming 4 walls, total area

4 * 6 = 24 m²

paints required:

since each wall needs 2 coats of paints then 1 can of paint will cover 5 m². for each wall which is 6 m² we have:

1 can = 5 m²

  ?  =   6 m²

let x represent the number of cans for 6 m² then for x, we cross multiply

x = 6/5

x = 1.2 cans

for 4 walls we have

4 * 1.2 = 4.8 cans

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