Haskell A-level project

I have been doing OO and imperative programming for the last few years however recently started functional programming in haskell and i love haskell now however I'm still not very advanced but i have to make a programming project for my A2 project which I have half a year to make - for the project I need to solve a real world problem - I want to do a mathematical problem so I was wondering what project ideas can I do with a lower level of haskell knowledge? I was thinking of an equation solver? I've made a basic version that can solve "3 + x = 9". Any suggestions welcome.