Solute B is distributed between immiscible solvents A and S in a two$-$stage, crosscurrent extractor. The relationship is found by E $=5$R$,$ where E and R are mass ratios of B to solvents in extract and raffinate, respectively. For $175$ kg of feed has $0\mathrm{.}4$B to be treated by two batch contacts of $70$ kg of solvent each time. Find the overall recovery.