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3. A holding tank initially contains 300 gallons of water. Polluted water, containing 2% oil, enters the tank at a rate of 5 gallons per

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3. A holding tank initially contains 300 gallons of water. Polluted water, containing 2% oil, enters the tank at a rate of 5 gallons per minute. The resulting (well mixed) solution leaves the tank at 4 gallons per minute. Find a formula, y(t), for the amount of oil in the tank after t minutes

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