HELP ME TO SOLVE THIS!!!

Question

***[isuru]*** · Answer

A 20g sample of Cu2S and CuS was mixed with 400 ml of 0.75 mol dm^(-3) KmnO4 in a medium of acid. And the byproducts of this reaction were SO2 , Cu(2+)  , Mn(2+)... SO2 was removed from the system by heating and remaining amount of extra MnO(-4) ion was subjected to a titration with a solution of 0.1 mol dm^(-3)  , Fe (2+) ion . The total amount of Fe(2+) needed was 350ml. (relative atomic masses - Cu2S -- 159.2 gmol^(-1) , CuS -- 95.6 g mol^(-1) )
    a. Write all the chemical reactions regarding above instance....
    b. find the percentage of Cu2S in the mixture at the beginning

***[isuru]*** · Answer

@TuringTest  , @ash2326  , @ajprincess  , @aaronq  ,@dan815  , @Compassionate  PLS HELP

aaronq · Answer

write equations first, they're giving you all the species in the question. All you need to do it put them in order.