Please answer what is requested. Separation tee to equilibrium in stages

Before liquefying it, the air is dried by placing it in contact with silica gel as an adsorbent. The air enters the dryer with 0.003 kg of water/kg of dry air and has to be dried to a minimum water content of 0.0005 kg/kg of dry air. Using the equilibrium data below, calculate the kg of gel per kg of dry air required for the following cases:

(a) a single-stage batch contactor

(b) a two-stage countercurrent system

(c) a two-stage contactor with crosscurrents and adsorbent flow divided into two equal parts

\begin{tabular}{llllllll} \hlineKggdryairKggH2O & 0.00016 & 0.000S & 0.001 & 0.0015 & 0.002 & 0.0025 & 0.003 \\ \hlineKgelKgHH2O & 0.012 & 0.029 & 0.044 & 0.060 & 0.074 & 0.086 & 0.092 \\ \hline \end{tabular}