Answer / s k majumder

First one have to choice grade of Concrete. Say M15 grade for which proportion is 1 : 2:4. total 7

N Now dry volume will be of 1 cum concrete is 1*1.52=1.52 cum

Hence
cement= 1.52/7 = 0.217cum = 7.66cft = 6.12 bag say 6 bag
sand (1,52/7)*2 = 0.434 cum= =15.33cft
Aggregate(=1.52/7)*4 =0.868cum= =30.66cft

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