19. A wall of length 10 m was to be built across an open ground. The height of the wall is
4 m and thickness of the wall is 24 cm. If this wall is to be built up with bricks whose
dimensions are 24 cm x 12 cm x 8 cm, how many bricks would be required? [NCERT]
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Answer:
For wall :
Length of wall = 10 m = 1000cm
Breadth of wall = 24 cm
Height of wall = 4m = 400 cm
Volume of wall = 1000 × 24 × 400 cm^3
For brick :
Length of brick = 24 cm
Breadth of brick = 12 cm
Height of brick = 8 cm
Volume of wall = 24 × 12 × 8 cm^3
Number of bricks = Volume of wall/ Volume of brick
= 1000 × 24 × 400/ (24 × 12 × 8)
= 4166.66
= 4167 approx.
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