Answer Posted / manoj mall

for brick size 230mmx115mmx75mm (1:4) for 1cum
volume of 1 brick= 0.00198
say 12mmtk mortar on brick layer
so vol of brick 0.00267 cum
No. of bricks in 1cum = 1/0.00267 = 375 num bricks
volume of bricks for 1cum = 375x0.00198=0.724 cum
volume of cement mortar 1~0.724=0.26cum
add 15% for wastae=0.3 cum
add 30% for dry mortarof 0.3 cum = 0.4 cum
for cm 1:4 = 1+4=5
qnty of cement 1/5 x 0.4 = 0.08 cum
1 bag of cement = 0.035 cum
0.08/0.035 = 2.28 bag
sand = 0.08 x 4 = 0.32 cum

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