Ononot — A tank contains 100 L of brine with an initial 50 kg of salt

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Differential Equationshard

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A tank contains $100$ L of brine with an initial $50$ kg of salt. Brine with concentration $0.5$ kg/L flows in at $5$ L/min, and the mixture flows out at $5$ L/min. What is the limit of the salt amount $A(t)$ as $t \to \infty$ ?