How many bricks each of diameter 22cm ,12cm,5cm are required to build a wall of dimension 50m long 2m high and 45m thick to leaving in it 2 gateways of dimensions3m wide and 2m high?
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surface area of brick
2*( 22*12+12*5+22*5)
868
gate ways
=3*2*2
=12
868+12=880
wall surface area
2*( 50*2+2*45+45*50,)
4880
no of bricks
=4880/880
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