There are many different ways that you could go with this (or with a mix of the two). You could talk about where gender inequality comes from. You could try to explain whether it is religion that has caused us to treat men and women differently or if it comes from the days when physical strength was much more important for daily life than it is now. Another thing that you could talk about would be the impact of gender inequality, how it affects individuals and societies. Finally, you might talk about how it could be combated and reduced.