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A tank contains 100 gallons of pure water. A salt solution with concentration 2.5 lb/gal enters...

A tank contains 100 gallons of pure water. A salt solution with concentration 2.5 lb/gal enters the tank at a rate of 4 gal/min. Solution drains from the tank at a rate of 4 gal/min. Find the eventual concentration of the salt solution using a qualitative analysis rather than by actually solving the DE.

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