Q5 of 94 Page 228

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

We know that,

Volume of cuboid = Length × Breadth × Height


Therefore,


Volume of each brick = 25 × 11.25 × 6


= 1687.5 cm3


Volume of wall = 800 × 600 × 22.5


= 10800000 cm3


Therefore,


Number of bricks =


= 6400


Hence, option C is correct

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