Answer Posted / enayatullah

Take the retio 1:1.5:3
Cement = 1
Sand = 1.5
Aggregates = 3
The volume of none mixed material is 1.52 m3 for one cu.m
mexid concret becouse the the aggregate sand and cement
have porosity that will fill with some of sand and
cement,so 1.52/(1+1.5+3)=1.52/5.5=0.276
Cement=0.276*1=0.276 cu.m = 0.276/0.036*50 bag = 383kg
0.036 is one bag volume
Sand = 0.276*1.5 = 0.414 cu.m
Aggregate = 0.276*3 = 0.828 cu.m
0.276+0.414+0.828=1.518 near to 1.52

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