Question

Find the quantity of paint required to paint all the faces of a room of dimensions 10 m $\times$ 8 m $\times$ 10 m, assuming paint to have negligible thickness.

• A. 800 $m^3$
• B. 520 $m^2$
• C. 360 $c{m}^2$
• D. 420 $c{m}^2$

Answer 1

The correct option is B

520 $m^2$

Length = 10 m
Breadth = 8 m
Height = 10 m
It is given that all the faces have to be painted and the paint is assumed to have negligible thickness.
Therefore, we have to paint all the 6 faces of the room.
Hence, we have to apply the formula of total surface area.
Amount of paint required = 2 (lb + bh + lh)
= 2 (10x8 + 8x10 + 10x10)
= 2 (80 + 80 + 100)
= 520 $m^2$