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To find the number of 40 kg bags of cement needed for a volume of concrete measuring 15 x 17 ft x 4 ft, first calculate the volume in cubic feet: 15 x 17 x 4 = 1020 cubic feet. Next, convert cubic feet to cubic meters (1 cubic foot = 0.0283168 cubic meters), resulting in approximately 28.8 cubic meters. A general rule of thumb is that one cubic meter of concrete requires about 350 kg of cement, so you would need about 10,080 kg of cement for this volume. Dividing 10,080 kg by 40 kg per bag gives you 252 bags of cement.

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