Answer Posted / kesav

For M20 concrete, The ratio of the mix is 1:1.5:3 (Nominal mix)
The total parts is 1+1.5+3 =5.5
Part of the cement is = 1/5.5
The total volume raw material for 1m3 of mixed concrete practically =1.57m3
Unit weight of cement =1440kg
Weight of cement per bag = 50kg

Now the calculation is =1/5.5X1.57X1440
= 411kg
In terms bags per m3 of conctrete is 411/50 = 8.22bags

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