A 200-liter tank initially contains 100 liters of brine solution containing 25kg of salt. A brine  solution containing 0.5 kg/ liter of salt flows into the container at a rate of 1 liter/min. The solution  is kept thoroughly mixed, and the mixture flows out at a rate of 0.5 liters/min. How much salt is  in the container after 10 minutes? When the tank is about to overflow, another drain is opened  at 1 liter/min. How much salt is in the tank when the volume returns to what it was initially?

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