Pulled it out of my a$$. But at about 15 aircraft per Squadron, we could get about 12 Squadron. 6 Actvie Duty, 2 Reserves and 4 for the Guard which leaves about 20 for Test and Evaluation Squadron's.
What about a training squadron? What about aircraft in depot-level maintenance? 200 still seems like quite a bit considering the Air Force is planning on having a total of just 356 A-10C's in their inventory as of 2011.