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A tank contains 100 gal of brine made by dissolving 80 lb of salt in water....

A tank contains 100 gal of brine made by dissolving 80 lb of salt in water. Pure water
runs into the tank at the rate of 4 gal/min, and the mixture, kept uniform by stirring runs
out at the same rate. Find the amount of salt in the tank at t=8 min.
Math   Calculus   
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