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A wall 9 m long, 6 m high and 20 cm thick, is to be constructed using bricks of dimensions 30 cm, 15 cm and 10 cm. How many bricks will be required.

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Length of the wall = 9 m = 9 x 100 cm = 900 cm
Height of the wall = 6 m = 6 x 100 cm = 600 cm
Breadth of the wall = 20 cm
Volume of the wall = 900 x 600 x 20 cm3 = 10800000 cm3
Volume of one Brick = 30 x 15 x 10 cm3 = 4500 cm3
Number of bricks required to construct the wall =  volume of wall/volume of one brick
= 10800000/4500
= 2400

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