Question

The number of bricks of 20cm by 10 cm needed to floor a room of size 20m by 16 m is

Answer 1

Let the no. of bricks be x
AQ.
⇒ Area of bricks × x = Area of room
⇒ 20 × 10 × x = 2000 ×1600
⇒ 200 × x = 2000 ×1600
⇒ x = 16000

Answer 2

Area of room =20000x16000
=320000
Area of brick. =20x10
=200
Bricks needed=320000\200
=1600