from the below figure $6\mathrm{.}20,$ knowing that the washout dilution rate is wrongly presented, obtain the correct dilutrion rate expression.

The washout dilution rate is obtained by setting $S_0=S_1=S_2.$

Wrong expression : $D_{wo}=\frac{{}_m{S}_0}{K_m+S_0}[\frac{(1-{)}^2{}_m{S}_0}{K_s+S_0-(1-)D^{\text{'}}{}_m{S}_0}+1]$