Answer / pradeep setty

your area should be 10'x10'in to thickness of concrete. Normally the thickness for open space is 4' to 5', but you have given the thickness has 25' also we need to select a standard concrete mix like M10,M15, M20...has per IS Code
So according to the dimension your requirement of concrete is 2.08m3 and i presume that M15(1:2:4) is sufficient for this work

Calculation
(1:2;4)= 7 cement by weight is 1440.00 kg/m3
1. cement required is 2.08/7 = 0.2971kg/m3* 1440.00 kg/m3 = 427.82 kg so (50 kg/bag) = 427.82/50 8.55 bags say 8.5 bags
2. Sand required is 0.2971*2 = 0.5942kg
3. Metal required is 0.2971*4 = 1.1884 Kg

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