18-in x 18-in = 324 sq in
324 sq in / 144 sq in per sq ft = 2.25 sq ft
2.25 sq ft / 9 sq ft per sq yd = 0.25 sq yd
Answer = 0.25 sq yd
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186.6 square yards of carpet are needed.
133.33 square yards of carpet
Total square yards: 88.89
170/9 = 18.9 square yards
20.22 square yards 13 ft x 14 ft = 182 square feet 182 square feet divided by 9 square feet per square yard = 20.22 square yards