Insufficient information.
You need to know the depth of topsoil you want to cover those 7550 sq ft.
By "yards" I assume you mean cubic yards -- a volume measurement.
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Almost exactly 2.00 cubic yards for every inch of topsoil depth.
77/9 cubic yards for every inch of depth.
Slightly less than 26 cu. yards.
if that is 3 ft deep it would require 96 yards... IF it is 3 inches deep it would require 24 cubic yards
A lot