Question

chapter mensuration​

Answer 1

Side of brick = 45 cm = 0.45m

Volume = 0.45 × 0.45 × 0.45

=0.091125cubic metre

Volume of room = 4.5 × 2.7 × 1.8

=21.87cubic metre

Bricks required = Volume of room ÷ Volume of brick

= 21.87 ÷ 0.091125

=240

Therefore,240 bricks are required.