The benzene is dioxane-free, and the equilibrium data

One thousand kilograms of a 30 wt% dioxane in water solution is to be treated with benzene at 25oC to remove 95% of the dioxane. The benzene is dioxane-free, and the equilibrium data of Example 5.2 can be used. Calculate the solvent requirements for:
(a) A single batch extraction
(b) Two crosscurrent stages using equal amounts of benzene
(c) Two countercurrent stages
(d) An infinite number of crosscurrent stages
(e) An infinite number of countercurrent stages