There can be no equivalence.
An inch is a measure of length or distance in 1-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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210 inches (1 foot/12 inches)= 17.5 feet = 17' 6''==============
9 square feet = 1 square yard 125' x 210' = 26,250 square feet = 2,9162/3 square yards
6 feet 10.7 inches.
I'm going to assume that the tiles are square inches, rather than square feet. But they can be converted to 3 square feet, which means 70 of them would cover the space if it were perfectly rectangular. Get 80 to be safe.
36 inches = 1 yard therefore 210 inches = 5 yards 30 inches (5 yards 2 feet 6 inches)