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A tank contains 100 litres of pure water. Brine that contains 0.1 kg of salt per litre enters the tank at a rate of 10

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A tank contains 100 litres of pure water. Brine that contains 0.1 kg of salt per litre 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 after 6 minutes

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