(Solution) - A tank initially contains 200 gallons of fresh water but -(2025 Original AI-Free Solution)

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A tank initially contains 200 gallons of fresh water but then a salt solution of unknown concentration is poured into the tank at 2 gal / min. The well-stirred mixture flows out of the tank at the same rate. After 1 20 min, the concentration of salt in the tank is 1.4 lb/gal. What is the concentration of the entering brine?