Q. 65.0( 2 Votes )

How many hollow blocks of size 30cm x 15cm x20cm are needed to construct a wall 60m in length, 0.3m in breadth and 2m in height.

Answer :


sides of small cuboid = 30cm x 15cm x20cm and sides of large cuboid = 60m x 0.3m x 2m

volume of small cube = 30cm x 15cm x20cm

= 9000cm3 = 0.009m3

volume of large cube = 60m x 0.3m x 2m

= 36m

Number of hollow blocks required = volume of large cuboid/ volume of small cuboid

N = 36/0.009

N = 4000

Number of hollow blocks required = 4000

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