None.
A foot is a measure of length or distance in 1-dimensional space while a square yard is a measure of area in 2-dimensional space. 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.
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There are 45 square feet in 5 square yards
15 ft = 5 yards 5 yards* 5 yards = 25 square yards
None but there are 15 feet in 5 yards
3.33 square yards.
If 5' is 5 yards and 3' is 3yards then 15 square yards * 9 else if 5' is 5 feet and 3' is 3 feet then 15