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Pure water flows into a tank at a rate of 10 L/min. The contents of the tank are preserved and mixed well. The contents flow

Pure water flows into a tank at a rate of 10 L/min. The contents of the tank are preserved and mixed well. The contents flow out at a rate of 10 L/min. Initially, the tank contained 10kg of salt in 100 liters of water. How much salt will there be in the tank after 30 minutes?

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