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Suppose a tank initially has 10 pounds of salt dissolved in 100 gallons of water. If brine at a concentration of 1/4 pound salt per

Suppose a tank initially has 10 pounds of salt dissolved in 100 gallons of water. If brine at a concentration of 1/4 pound salt per gallon is entering the tank at the rate of 3 gallons per minute and the well stirred mixture leaves the tank at the same rate, how much salt is left in the tank after 30 minutes?

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