Answer / Pritam Prag

To calculate the requirement of cement, steel, and sand for a 1128 sqft area with a 1:2:4 ratio (cement:sand:steel), first we need to find the volume of concrete required. Assuming a unit weight of dry concrete mix as 2400 kg/m^3, the volume can be calculated as follows: Volume of concrete = Area * Depth. Let's assume the depth is 0.15 m (common for residential slabs). Now we have the volume in cubic meters. To find out the number of bags of cement required, note that one bag of cement weighs approximately 50 kg and occupies a volume of about 0.036 cubic meters. The number of bags can be calculated as: Number of bags of cement = Volume of concrete / Volume per bag. For steel, since it is given in the ratio of 4:1:2, we need to find the weight of steel first and then convert it to Kgs. Assuming the density of reinforcement bars as approximately 7850 kg/m^3, we can calculate the volume of steel required, then its weight.

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