A tank initially contains 100L of brine in which there dissolved 20kg of salt. Pure water flows into the tank at a rate of 10L per minute and the mixture is kept uniform by stirring. The stirred...

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Extracted text: A tank initially contains 100L of brine in which there dissolved 20kg of salt. Pure water flows into the tank at a rate of 10L per minute and the mixture is kept uniform by stirring. The stirred mixture simultaneously flows out at the rate of 7 minutes per minute. (a) How much salt is in the tank at any time t? (c) How much salt is in the tank in the long run?