A tank contains 1, 500 L of water and 20 kg of dissolved salt. Fresh water is entering the tank at 15 L/min (the solution stays perfectly mixed), and the solution drains at a rate of 10 L/min. How much salt is in the tank at t minutes and at 10 minutes? What is the long-term behavior of the solution assume that the tank is very large and overflow will not occur? Graph your solution using GeoGebra.

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