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A tank contains 1000 L of brine (saltwater) with 15 kg of dissolved salt. Pure water...

A tank contains 1000 L of brine (saltwater) 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 after t minutes?

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