A tank contains 1000 L of brine with 15 kg of dissolved salt. Pure water enters the

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A tank contains 1000 L of brine 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
(a) After minutes
(b) After 20 minutes?
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