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

A tank initially contains 10 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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