The value of a project is determined by the contents. But that doesn't mean that everything must be included. Others have to be able to read your project with pleasure and understand what you want to say to them. The text has to be written in good English. A project is nearly always an account of what you have done. This should certainly include points that you have considered but have not lead you to reach a conclusion. The inclusion of an unsolved problem can make the reader of your report think and seek out information for him or herself.