Both OXIDATION POTENTIALS are given. (PLZ OBSERVE)
Zn has higer OP so it will be the anode
Fe therefore is cathode.
Fe will have red pot. of -0.40 (OBVIO)
E0CELL = E0RED+E0oxi
they asked Eo for the overall reaction
since Eo value of zinc is higher, it will undergo reduction (cathode)
therefore Eo of cell =Ecathode -Eanode(this is how i remember it)
therefore Eo of cell = 0.76-0.40= 0.36 V