# First order linear differential equations 3

I am not sure how to set up the equation for this question or what steps i should be taking. Please help!

• The answer is B – Noah I Apr 3 '17 at 17:59

[rate in]$=24 g/min$ [rate out]$=4(S/68)$ (four galons per minute leaked from the tank that has an amount of salt of $S/68$ As said in the wording of the problem,
$S'=$[rate in]-[rate out], $S'=24-S/17$. The solution is B as Noah said.
The solution is $S(t)=408-408e^{-t/17}$