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A concrete aggregate mix must contain at least 28%sand by volume (m*) for an adequate measurement. A supplierDo you deliver the mixture with 25% sand

A concrete aggregate mix must contain at least 28%sand by volume (m) for an adequate measurement. A supplierDo you deliver the mixture with 25% sand and 75% gravel for R$ 300.00/m?Another supplier B delivers with 40% sand and 60% gravel for R$440.00/m. Determine the lowest cost per cubic meter (m) of theconcrete aggregate.

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