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A large tank is filled with 80 gallons of fluid in which 2 pounds of salt...

A large tank is filled with 80 gallons of fluid in which 2 pounds of salt are dissolved. Brine containing 1/2 pound of salt per gallon is pumped into the tank at a rate of 3 gal/min. The well-mixed solution is then pumped out at the same rate of 3 gal/min. Find the concentration of salt in the tank after 30 minutes.

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