Answer:
37 Boxes
Step-by-step explanation:
She ends up with 22 boxes after half of them are burned.
Before the fire she had 22•2 boxes which is 44.
She had 44 boxes after she bought 7.
Before she bought 7 boxes she had 44-7 boxes which is 37.
She had 37 boxes before she bought 7 boxes and the fire burned half her boxes.
She started with 37 boxes.
