Answer / 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.

Answer / madhusudhan reddy

1.25 CFT = 50 KG = 1.0 BAG OF CEMENT
1.00 CFT = 40 KG = 0.8 BAG OF CEMENT

Answer / sfz ans

http://theconstructor.org/practical-guide/estimated-quantities-of-materials-required-per-cubic-metre-of-compacted-mortar-or-concrete/1304/

Answer / sumit

for 1 cubic meter (1:1.5:3)

1/1:1.5:3*1.52*28.8=6.4bags of cement

sand 6.4 *50*1.5= 480 cu ft

agg 6.4*50*3=960kg

Answer / khan9219362784

Ratio for concrete M20 equal is 1,1,2
Total volume equal is 1cft 
Concrete dry volume equal is 1.52
Cement bags= 1/4*28.8*0.028*1.52 equal is 0.306 bags
            = 15.32 kg cements 
Sand equal is 1/4*0.028*1.52 equal is 0.170 Cum
            = 0.375 cft sand
Agregats equal is 2/4*0.028*1.52 equal is 0.021 Cum
           =  0.751 cft agregats

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