30 feet x 12 feet is 52 square yards
30 yards x 12 yards is 468 square yards
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30 feet x 20 feet = 600 square feet.
Assuming that 12 x 12 is 12" x 12" (one square foot), then 30 one-square-foot tiles would cover 30 square feet.
There are 9 square feet in a square yard. A room 20 x 12 has 240 square feet. Divide that by 9 and you get 26.67 square yards.
33.44509 square meters
3 x 30 = 90 square feet. 1 square foot = 144 square inches (12 x 12) So 90 square feet = 12,960 square inches