Question: Use engineering problem solving method. Raw primary sludge at a solids concentration of 4 % is missed with waste activated sludge at a solids concentration

Use engineering problem solving method. Raw primary sludge at a solids concentration of 4% is missed with waste activated sludge at a solids concentration of 0.5%. The flows are 20 and 24 gal/min, respectively. What is the resulting solids concentration?

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