Answer :

Length of brick = 20 cm


Breadth of brick = 10 cm


Height of brick = 7.5 cm


Brick is in the shape of a cuboid


Volume of cuboid = length × breadth × height


volume of 1 brick = 20 × 10 × 7.5


= 1500 cm3


Let n bricks be required to make the wall


Length of wall = 5 m = 500 cm


Breadth of wall = 30 cm


Height of wall = 3 m = 300 cm


Volume of wall = 500 × 30 × 300


= 4500000 cm3


The wall is completely made from bricks therefore


Volume of n bricks = volume of wall


n × volume of one brick = 56100000


n × 1500 = 4500000


n =


n =


n = 3000


Number of brick required = 3000


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