Suppose a tank initially contains 10 pounds of dissolved salt in 100 Gallons of water. At time t = 0, water containing 0.2 pounds of salt per gallon begins flowing in at a rate of 2 gallons per minute. At the same time, a drain opens allowing the perfectly- stirred mixture to also flow out at 2 gallons per minute. One hour later (t=60), what is the amount of salt in the tank, and what is the concentration of salt in the mixture?

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