Answer Posted / sfz ans

M20 (1: 1.5: 3)

Wet mix = (Dry mix)x 1.52 ie: 52% more

Cement = [ 1/(1+1.5+3) ]x 1.52 = 0.2763cum
ie: 0.2763cum/1cum conc
ie: 0.2763cum/35.25cft conc
ie: 0.00783 cum/cft conc
ie: (0.00783/.0347)bags = 0.2258 bags = 0.2258 x 50 = 11.29kg

Therefore
Sand = 11.29 x 1.5 = 16.941 kg
Agg = 11.29 x 3 = 33.87 kg

Note: But Concrete is always estimated in cubic meters.

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