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(1) Solve the differential equation. d_y_ $31 Lise2mg (2) A tank contains 1000 L of brine with 15 kg of dissolved salt. Pure water enters

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(1) Solve the differential equation. d_y_ $31 Lise2mg (2) A tank contains 1000 L of brine with 15 kg of dissolved salt. Pure water enters the tank at a rate of 10 L /min. The solution is kept thoroughly mixed and drains from the tank at the same rate. How much salt is in the tank (a) after t minutes and (b) after 20 minutes

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