A 400-gallon tank initially contains 100 gallons of brine containing 75 pounds of salt. Brine containing 1 pound of salt per gallon enters the tank at a rate of 5 gallons per second, and the well-mixed brine in the tank flows out at a rate of 3 gallons per second. How much salt will the tank contain when it is full of brine?
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Linda H.
A 400-gal tank initially contains 100 gal of brine containing 50 lb of salt. Brine containing 1 lb of salt per gallon enters the tank at a rate of 5 gal/s, and the well-mixed brine in the tank flows out at the rate of 3 gal/s. How much salt will the tank contain when it is full of brine?
Pavi S.
A tank contains 1000 L of brine with 15 $\mathrm{kg}$ of dissolved salt. Pure water enters the tank at a rate of 10 $\mathrm{L} / \mathrm{min.}$ The solution is kept thoroughly mixed and drains from the tank at the same rate. How much salt is in the tank (a) after t minutes and (b) after 20 minutes?
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