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c). A tank contains 400 gal of brine in which 100 1b of salt are dissolved. Fresh water runs into the tank at a rate

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c). A tank contains 400 gal of brine in which 100 1b of salt are dissolved. Fresh water runs into the tank at a rate of 2 gal/min. The mixture, kept practically uniform by stirring, runs out at the same rate. How much salt will there be in the tank at the end of 1 hour? [5 marks]

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