Question

How many bricks, each measuring 25cm × 11.25cm × 6cm, will be needed to build a wall 8m long, 6m high and 22.5 cm thick?

(a) 5600 (b) 6000 (c) 6400 (d) 7200

Answer 1

(c) 6400

Explanation:

We know that volume of cuboid= length × breadth × height

Volume of brick = 25cm × 11.25cm × 6cm

= 1678.5 cm³

Volume of the wall = 80 × 60 × 22.5

= 10800000 cm³

Number of bricks = 10800000/ 1678.5 = 6400