Ex. Given: A storage tank at a food processing plant initially contains 30 ft³ of clean water. Fluid is withdrawn from the tank at a steady rate of 1 cfs.

A stream of sugar/water mixture containing 20 lb/ft³ of sugar is introduced into the tank at a rate of 3 cfs. Assume that fluid in the tank is mixed instantly, that the sugar is non-reactive, and that the outflow concentration is equal to the concentration of fluid in the tank. Find: a. Draw a diagram of the process and identify important parameters. b. Calculate the time required for the solution volume in the tank to reach 50 ft³. c. Estimate the average sugar concentration in the outflow stream from the start until the tank volume reaches 50 ft³.