Answer / madhusudhan

for 1 m³ concrete (M20=1:1.5:3)the material required is
(1+1.5+3)=5.5
1/5.5=0.1818*1440=261kg cement or 5.32 bags
1.5/5.5=0.272 m³ Fine aggregate
3/5.5=0.545 m³ Coarse Aggregate

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