Answer Posted / arun gandhamwar

01 cum wall = 500 No. Bricks with Mortar
size of Bricks with Mortar = 200 mm x 100 mm x 100 mm

With Mortar     = 0.20 x 0.1 x 0.1  
                = 0.002 cum = 1.0 cum
Without Mortar  = 0.19 x 0.09 x 0.09
                = 0.00153 cum = 0.769 cum

Mortar Quantity = With Mortar - Without Mortar
                = 1.0 - 0.769 
                = 0.231 Cum

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