Raw primary sludge at a solids concentration of 4% is mixed 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? This mixture is thickened to a solids concentration? This mix of 8% solids. What are the quantities (in gallons per minute) of the thickened sludge and thickener overflow (water) produced? Assume perfect solids capture in the thickener.