Answer Posted / achutharaj

we calculate the qty of cement,sand ,aggregate in cu.m,then
we multiple specific weight * qty of cement calculated =
qty in kgs

example 1:2:4

cement specific weight 1440kg/m3
cement qty in cu.m = 0.22
cement qty in kg = 0.22*1440=322kg
sand,aggregate specific weight 1840kg/m3,1550kg/m3

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