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3. A large tank contains 60 gallons of brine and has 12 Ibs of salt dissolved in it. New brine containing 3 lbs of dissolved

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3. A large tank contains 60 gallons of brine and has 12 Ibs of salt dissolved in it. New brine containing 3 lbs of dissolved salt/ gallon flows into the tank at a rate of 5 gallons/minute. The mixture is kept uniform by stirring. The stirred mixture flows out at a slower rate of 1 gallon/minute. Find the amount of salt in the tank after 10 minutes and at any time t. 4

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