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11. [4 points] A tank contains 100 L of water. A solution with a salt concentration of 0.5 kg/L is added into the tank at

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11. [4 points] A tank contains 100 L of water. A solution with a salt concentration of 0.5 kg/L is added into the tank at a rate of 6 L/min. The solution is kept well mixed and drained from the tank at a rate of 4 L/min. Find the amount of salt in the tank as a function of time

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