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A tank contains 20 kg of salt dissolve in 5000 L of water. Brine that contain...

A tank contains 20 kg of salt dissolve in 5000 L of water. Brine that contain 0.03 kg of salt per liter of water enters the tank at a rate of 25 L/min. The solution is kept thoroughly mixed and drains from the tank at the same rate. How much salt remains in the tank after 13 minutes? (Keep three decimal places.)

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