5 Fe0 + 3 KMnVIIO4 + 24 HCl 3 MnIICl2 + 5 FeIIICl3 + 3 KCl + 12 H2O

This is an oxidation-reduction (redox) reaction:

3 MnVII + 15 e- 3 MnII (reduction)

5 Fe0 - 15 e- 5 FeIII (oxidation)

Change the oxidation states