Answer Posted / guest

for calculation lets take 1: ratio plastering 12mm th.
for 1 sqm
so total volume = .012x1=.012 cum

increase by 20% fir filling
depression= .012+.012x1/5=.0144cum in wet condition
when dry increase the volume by 1/3rd.
.0144+1/3x.0144=.0576 cum
summation of proportion=7
cement=.0576/7=.0082cum=.237 kg
sand=..0082x6=.492 cum

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