A Tank Contains 500 Liters of Brine with 10 Kg $t$

question 39

Essay

A tank contains 500 liters of brine with 10 kg of dissolved salt. Pure water enters the tank at a rate of 10 liters per minute. 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 10 minutes?

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