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[10 Marks] A tank initially contains 20 kg of salt dissolved in 100 L (liters) of water. Fresh water is entering the tank at 30

[10 Marks] A tank initially contains 20 kg of salt dissolved in 100 L (liters) of water. Fresh water is entering the tank at 30 L/min. We assume that the mixture is stirred instantly so that the salt is always uniformly distributed throughout the mixture. And the mixture is drained from the tank at a rate of 10 L/min. How much salt is in the tank at t minutes and at 50 minutes

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