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Question 117

How many bricks of size 22 cm×10 cm×7 cm are required to construct a wall 11 m long, 3.5 m high and 40 cm thick, if the cement and sand used in the construction occupy (110)th part of the wall?


Solution

Volume of each brick =22 cm×10 cm×7 cm=1540 cm3=0.00154 m3
Volume of wall =l×b×h=11m×3.5m×40100m      [ 1m = 100 cm]
=11×3.5×0.4=15.4 m3
If 110th part of the wall used in cement and sand, then part of wall used by cement and sand =15.410m3=1.54 m3
Remaining part =15.41.54=13.86m3
Number of bricks =Volume of wall to be constructVolume of each brick=13.860.00154=9000

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