A yard, of course!
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Each yardstick measures 3 feet. Two yardsticks is 6 feet. One 12-inch ruler is one foot. Laid end to end, this makes 7 feet.
So each tile is 12" by 12" square, right? So each tile is ONE square foot? (a perfect square that's a foot long and a foot wide). Each tile is one square foot and you need to know how many add up to 400 square feet. I think the answer is the square root of Pi.
There are 12 inches in a foot and four quarters on each inch so there are 12*4=48 qurters of an inch in one foot.
Three - two in the middle and one at the end.
There are two - one at each end.