15ft is 5 yds, so 15ft x 15ft is the same as 5yds x 5yds which would equal 25 square yards.
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To find the area of the room in square feet, you multiply the length by the width: 12ft x 15ft = 180 square feet. To convert square feet to square yards, you divide by 9 (since 1 square yard is equal to 9 square feet): 180 square feet / 9 = 20 square yards. Therefore, there are 20 square yards in a 12ft x 15ft room.
8.25 cubic yards of concrete
3 feet = 1 yard and so 4 times 5 = 20 square yards
120 of them.
30' x 20' (600 square feet) = 66.6 square yards.