Let the number of bricks needed be 'n' ATQ: Volume of the wall = n X volume of each brick Using, volume a cuboid = Length X Breadth X Height (Since, wall and brick both are in shape of cuboid) 400 X 450 X 20 = n X (30 X 10 X 16) Or, 'n' = {(400 X 450 X 20)/(30 X 10 X 16)} Or, 'n' = 750 So, required number of bricks needed = 750
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