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Question: how do you do this diff eq question...

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How do you do this diff eq question?

1.5.33 Question Help A tank contains 2000 liters (L) of a solution consisting of 70 kg of salt dissolved in water. Pure water is pumped into the tank at the rate of 3 L/s, and the mixture-kept uniform by stirring-is pumped out at the same rate. How long will it be until only 7 kg of salt remains in the tank? It will take aboutseconds. (Round to the nearest second as needed.) Enter your answer in the answer box and then click Check Answer.

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