Answer / rohit dhingra

for this we need the given concrete grade as for m20.

calculate volume in cum = 1x0.2 = 0.2 cum

for m20 multiply with 8.064 for cement = 1.61 cement bags
sand = 0.42x0.2 = 0.084 cum
aggregate = 0.84x0.2 = 0.168 cum

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