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Concentration, Rate of Flow and Dilution

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In a tank containing 100 gallons of fresh water, 10 lbs of salt was added instead of 20 lbs. To correct the mistake, fresh water was added at the rate of 3 gallons per minute while draining off the well stirred salt solution from the tank at the same rate. How long will it take until the tank contains the correct amount of salt?

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Concentration, Rate of Flow and Dilution are investigated. The solution is detailed and well presented.

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