To construct a wall 20 m long, 0.6 m wide and 5 m high, bricks of dimensions 25 cm x 15 cm x 9 cm each are used. If the mortar occupies 1/10th of volume of the wall, find the number of bricks used.
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According to the question :
☆ Volume of the wall = 20 × 0.6 × 5
=> 60 m.
☆ Volume occupied by the brick = 1 / 10 of the volume of the wall
=> 1 / 10 × 60
=> 6 m.
☆ Volume of 1 brick = 25 / 100 × 15 / 100 × 9 / 100
=> 1 / 4 × 3 / 20 × 9 / 100
☆ Bricks used = volume occupied by the brick / volume of 1 brick
=> 6 / ( 1 / 4 × 3 / 20 × 9 / 100 )
=> 6 / ( 4 / 1 × 20 / 3 × 100 / 9 )
=> 160 × 100 / 9
=> 1777.77
=> appro.1778 bricks.
The number of bricks used = 1778 bricks.
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