A tank is initially filled with pure water of and $\{$:$c_0=0\frac{kg}{m^3}).$ A stream

of brine containing $20k\frac{g}{m^3}$ of salt $(c_{in}=20\frac{kg}{m^3})$ is fed to the tank at a rate of

$0\mathrm{.}02\frac{m^3}{s}(Q_{in}=0\mathrm{.}02\frac{m^3}{s}).$ Liquid flows from the tank at a rate of $0\mathrm{.}01\frac{m^3}{s}$

$).$ It is assumed that the density $()$ of brine is constant. If the

tank is well agitated, what is the salt concentration in the tank $(c),$ when the tank

contains $4m^3$ of brine?

A tank is initially filled with pure water of and $($:$c_0=0\frac{kg}{m^3}$