A 30-gallon tank initially contains 15 gallons of salt water containing 7 pounds of salt. Suppose salt water containing 1 pound of salt per gallon is pumped into the top of the tank at the rate of 2 gallons per minute, while a well-mixed solution leaves the bottom of the tank at a rate of 1 gallon per minute. How much salt is in the tank when the tank is full? Enter the exact numerical answer as a decimal. Do not enter a calculation. Question Help: Video Submit Question

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