Answer Posted / pandian.a

cement = spgr/1+2+4=1.56/7=0.22cum sp gr of 20 mm=1.56c
0.22*1440=317 kg
317/50=6.5 bags wt of cement =1440kg/cum
sand=0.22*2=0.44cum
coarse
aggregate=.22*4=0.88cum

so cement=605 bags
sand=0.44 cum (15.52cft)
corse aggregate=0.88cum (31.04cft)
w/c ratio=12.5litre/bags

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