Answer Posted / lawrence.m

We assume the thickness is approx. 0.5inch. So that the volume is 100sqftx0.5=50cft(1.416cum).
For 1 cum( CM1:4), 1/5x 1440= 288Kg cement required.
Therefore, 1.416cum = 407 Kg required(Approx 8 bags)

For CM 1:3, = 510 Kg (Approx. 10 bags)

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