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4.2 Mixing problems (Section 1.8(b) in book)

The main idea is to set an ODE using $\frac{dS\left ( t\right ) }{dt}=R_{in}-R_{out}$ where $R_{in}$ is rate of mass of salt coming into the tank and $R_{out}$ is rate of mass of salt leaving tank. This gives an ODE to solve for $S\left ( t\right )$ using initial conditions which is given. At end, divide by volume of tank to get concentration at time $t$. See book example at page 54.