It wasn't to specifically answer your question, just to give some facts, that's all.
I do not know how many of the people are actually teaching in classes, nor what they teach, but I'm sure that you could get those numbers from them.
Are you aware that 40% of all Detroit students now attend charter schools? Or that the Emergency Manager closed over 100 schools and cut 800 teaching jobs last year, increasing the classroom sizes dramatically? They are over 40 students in a classroom, and up to 60 in a high school classroom. All of this was widely broadcast through the media.
Maybe you don't fire the ones that you have?