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A tank initially contains 100 pounds of salt dissolved in 500 gallons of water. Saltwater containing...

A tank initially contains 100 pounds of salt dissolved in 500 gallons of water. Saltwater

containing 5 pounds of salt per gallon enters the tank at the rate of 2 gallons per minute.

The mixture (kept uniform by stirring) is removed at the same rate of 2 gallons per minute.

How many pounds of salt are in the tank after an hour?

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