The concentration of a solution is defined as the amount of a substance divided by the volume of the solution. Suppose a vat contains 20 kg of salt and 40 liters of water. At t = 0, water is added at a rate of 20 liters/minute, while salt is added at a rate of 6 kg/minute. A function giving the concentration after t minutes will be C'(t) = = kg/liter (express as a function of t) As time passes, the concentration will Decrease Increase to kg/liter.

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