A large tank is partially filled with 100 gallons of fluid in which 20 pounds of salt is dissolved. Brine containing pound of salt per gallon is pumped into the tank at a rate of 6 gal/min. The well-mixe solution is then pumped out at a slower rate of 4 gal/min. Find the number of pounds of salt in the tank after 15 minutes. (Round your answer to two decimal places.) x lb

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