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 $)=(20\frac{kg}{m^3}$ is fed to the tank at a rate of $)=(0\mathrm{.}02\frac{m^3}{s}.$ Liquid flows from the tank at a rate of $0\mathrm{.}01\frac{m^3}{s})=(0\mathrm{.}01\frac{m^3}{s}.$ 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?Problem description

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