15 x 3 = 15 + 30 = 45 feet
45 x 12 = 90 + 450 = 540 inches
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15" is equal to 5/12 yard
15 yards is the same as 45 feet, since there are 3 feet in a yard.
There are 3 feet in 1 yard so 15 feet is equal to 5 yards. So a 15 feet by 15 feet room is a 5 yard by 5 yard room. 5 yards x 5 yards = 25 square yards.
One yard is equal to three feet. A yard is bigger.
3 feet equal 1 yard