$[-/3$ Points$]$ SESSCALCET$21\mathrm{.}6\mathrm{.}049.$ per liter$)$ is

$C(t)=\frac{35t}{320+t}$

After $t$ minutes $25t$ liters of brine with $35$ g of salt per liter has been pumped into the tank, so it contains $$ liters of water and $$ grams of salt. Therefore, the salt concentration at time $t$ will be the following.

$C(t)=\frac{875t}{8000+25t}=\frac{35t}{320+t}\frac{g}{L}$

$($b$)$ What happens to the concentration as $t?$

$\underset{t}{lim}c(t)=$

$$ g$/$L

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