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 :

Given:

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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