None.
A foot is a measure of 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.
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1 foot = 0.33333333 yard
the answer is 40 square yards
.33333333 is how many yards is a foot.
3 foot = 1 yard so 30 foot x 30 foot floor = 10 yard x 10 yard floor = 100 square yards.
1 square yard = (3 x 3) = 9 square ft. Area of the room = (16 x 18) = 288 square ft = (288 / 9) = 32 square yards