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A tank contains 40 kg of salt dissolved in 100 L of water. A solution of a concentration of 0.2 kg of salt per liter

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A tank contains 40 kg of salt dissolved in 100 L of water. A solution of a concentration of 0.2 kg of salt per liter enters the tank at a rate of 3 L/min. The solution is mixed and drains from the tank at the same rate. Find the kilograms of salt in the tank after 45 minutes

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