Definately 15. And a half.
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13*9 = 117 sq ft
1788/9 square feet on the floor, and the same number more on the ceiling. There are also many more square feet on the walls, but to calculate them, we'd need to know the height of the ceiling above the floor.
There are 3 feet in one yard. Therefore, 13 feet is equal to 13/3 = 4 yards 1 foot.
13-ft x 18-ft = 234 ft2
About 201.486 square feet.