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A tank contains 400 gal of brine in which 100 lb. of salt are dissolved. Fresh water runs into the
tank at a rate of 2 gal/min. The mixture, kept practically uniform by stirring, runs out at the same rate.
How much salt will there be in the tank at the end of 1 hour?


Sagot :

A tank contains 1000 L of brine with 15 kg of dissolved salt. Pure water enters the tank at a rate of 10 Lymin. 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? (b) After 20 minutes?