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A 200-gallon tank is currently half full of water that contains 30 pounds of salt. A...

A 200-gallon tank is currently half full of water that contains 30 pounds of salt. A solution containing 3 pounds of salt per gallon enters the tank at a rate of 5 gallons per minute, and the well-stirred mixture is withdrawn from the tank at a rate of 5 gallons per minute. How many pounds of salt are in the tank 10 minutes later?

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