Assuming it's 45" and that you can cut 5" without waste, you can get 9 squares (for me, I'd get 8). I would conservatively plan on 8, but, yeah, 9 if you're really really precise.
1 yard = 36" = 35" -> 7 squares (assuming it's a full 35". Some of the pieces I get are cut really askew and I lose more than 1").
So really conservatively, I would say 48; conservatively 56; probably not going to happen but theoretically possible 63