large tank is partially filled with 100 gallons of fluid in which 40 pounds of salt is dissolved. Brine containing 1/2   pound of salt per gallon is pumped into the tank at a rate of 6 gal/min. The well-mixed solution is then pumped out at a slower rate of 4 gal/min. Find the number of pounds of salt in the tank after 20 minutes. (Round your answer to two decimal places.)

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