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.
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
Almost exactly 2.00 cubic yards for every inch of topsoil depth.
You would need 31.88 cubic yards of topsoil to cover 855 sq feet at 6 inches deep.
77/9 cubic yards for every inch of depth.
Slightly less than 26 cu. yards.
You already have a square yard of topsoil, so how does 20 inches of depth get you the volume of topsoil? There are 36 inches in a yard, and you have 20 inches of topsoil depth that's 20/36ths of a yard of topsoil depth. That's 0.555... or about 0.56 yards. The volume of topsoil is 1 yard by 1 yard by 0.56 yards, or about 0.56 cubic yards of topsoil.
if that is 3 ft deep it would require 96 yards... IF it is 3 inches deep it would require 24 cubic yards
14.8 yards
A lot
1000000 cubic yards
To cover an area of 27 feet by 27 feet to a depth of 12 inches (1 foot), you first calculate the volume in cubic feet: 27 x 27 x 1 = 729 cubic feet. Since there are 27 cubic feet in a cubic yard, you divide 729 by 27, which equals 27 cubic yards of topsoil needed.
The answer depends on the depth to which you wish to cover it.
It takes 5.0926 cubic yards or 137.5 cubic feet.