There is no equivalence.
A foot is a measure of length or distance while a square yard is a measure of area. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
15 square yards = 135 square feet.
15 square yards = 135 square feet.
15' x 15' (225 square feet) = 25 square yards.
15 square feet = 1.66 square yards.
45' x 15' (675 square feet) = 75 square yards.
15 square yards = 135 square feet.
25 square yards.
15 square yards = 135 square feet. (To repeat this type of calculation, just multiply square yards by 9 to get square feet).
There are 9 square feet in 1 square yard - so 15 square yards contains 9 x 15 = 135 square feet.
15 ft = 5 yards 5 yards* 5 yards = 25 square yards
One square yard is 3 * 3 = 9 square feet. 15 square feet is 1 2/3 square yards.
15' x 17' (255 square feet) = 28.3 square yards.
12' x 15' (180 square feet) = 20 sq. yards.