Electrochemistry

Calculate the standard cell potential in (V) of the cell in which following reaction takes place : Fe²⁺(aq) + Ag⁺(aq) $\to$ Fe³⁺(aq) + Ag (s) Given that $E_{A{g^ + }/Ag}^o = xV$ $E_{Fe^{2+ }/Fe}^o = yV$ $E_{Fe^{3+ }/Fe}^o = zV$