Help !

1. You have the following data: You are going to carry out this reaction in a series of reactors. You want to use a CSTR and a PFR in series. If you want the intermediate conversion to be 30% and you have the CSTR first, how large is the CSTR? If the final conversion needs to be 80%, what volume should the PFR that follows the CSTR be? What would the volumes of the reactors be for the same intermediate 30% conversion and final 80% conversion, but with the PFR before the CSTR