A very large tank initially contains 100 kg of a 60% brine (60 wt% salt in water). At the start of a process, an inlet stream of 10 kg/min of a 10% brine solution begins flowing into the tank. Solution also begins to drain out of the tank at a rate of 15 kg/min. Assume complete mixing. Calculate the total mass of the tank contents after 10 min. Then, calculate the mass of salt in the tank after 10 minutes

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