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A 200 gallon tank initially has 100 gallons of a salt solution that contains 5 lbs...

A 200 gallon tank initially has 100 gallons of a salt solution that contains 5 lbs of salt. A salt solution is pumped into the tank at a rate of 4 gallons per minute with a concentration of 1 lb of salt per gallon. The well-mixed solution is pumped out of the tank at a rate of 2 gallons per minute. How much salt will be in the tank after 30 minutes? Round to one decimal place.

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