A mixture of FeO and Fe2O3 is completely reacted with 100 mL of 0.25 M acidified KMnO4 solution. The resultant solution was then titrated with Zn dust which converted the Fe3+ ions to Fe2+ ions. The Fe2+ ions required 1000 mL of 0.10 M K2Cr2O7 solution. Find out the weight percentage of Fe2O3 in the mixture.