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A tank initially contains salt in the pores of inert materials and 10 gallons of fresh...

A tank initially contains salt in the pores of inert materials and 10 gallons of fresh water. The salt dissolved at a rate per minute of 2 times the difference between 3 lb/gal and the concentration of the brine. Two gal of fresh water enters the tanks per minute. How much salt will be dissolved in the first 10 min? in the second 10 min? Ans.: 40 lb, 32 lb.

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