A continuous countercurrent multistage system is to be used to leach oil from meal by benzene solvent. The process is to

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A continuous countercurrent multistage system is to be used to
leach oil from meal by benzene solvent. The process is to treat
2000 kg/h of inert solid meal (B) containing 800 kg oil (A) and
also 50 kg benzene (C). The inlet flow per hour of fresh solvent
mixture contains 1310 kg benzene and 20 kg oil. The leached solids
are to contain 120 kg oil. Assume that constant underflow of N=1.85
kg solid/kg solution. Calculate the exit flows and compositions and
the number of stages required.