Answer Posted / daniel dandan

for 1 cu.m of concrete, (1:2:4)
1=cement; 2=sand; 4=gravel

add 25% for loose volume(to cover voids),
total concrete volume = 1.25 cu.m.

total parts = 1+2+4 = 7 parts

cement = (1/7)*1.25
= 0.1786 cu.m

density of cement = 1440kg/cu.m

thus, 0.1786 * 1440 = 257.184kg.

for 40kg per bag of cement:
bag of cement = 257.14kg/(40kg per bag)
= 6.4 bags....answer

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