Question

How many liters of paint must you buy to paint the walls of a rectangular prism-shaped room that is 16m by 12m with a ceiling height of 8m if 1 L of paint covers 40m^2? (Assume there are no doors or windows and paint comes in 1 L cans.)

Answer 1

The length of the room is 16 m.

The breadth of the room is 12 m

The height is 8 m

So, the area of four walls of the room is

$\begin{gathered} A=2(16\times12+12\times8+16\times8) \\ =832\text{ sq. m} \end{gathered}$

40 sq. m is covred by 1 L paint.

So, to cover 832 sq. m, total paint required is

$\frac{832}{40}=20.8\text{ L}$

Hence, 20.8 L of paints must be bought