Discussion
A mixer receives 100 kilograms per hour of a 20 per cent solution and 50 kilograms per hour of a 50 per cent solution. What is the concentration of the product?
Answer: C
Twenty kilograms of solute plus twenty-five gives forty-five in a hundred and fifty kilograms, which is thirty per cent. Averaging the two percentages directly would give thirty-five and ignores the different flow rates.
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