Formula to determine which checkbox is checked and return text value

I thought this would be simple, but I have failed.  

I am looking for a way to determine which of 20 formula-check boxes is checked and return a text value based on which box is true.  This is to find what current task a project is in.  I have tried the IF/& statement but it would throw errors or the output was incorrect.  I looked at the API_DoQuery, but not sure how to make it perform the task I want (lack of API knowledge).

Any thoughts for the community.