A 500 gallon tank is completely filled with water. Pure water is poured into the tank at a rate of 5 gal/min. At the same time, brine containing 2 lb of salt per gallon flows into the tank also a rate of 5 gallons per minute. The mixture flows out of the tank at a rate of 10 gal/min. What is the amount of salt in the tank after 10 minutes?

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