To get the area you multiply the length and the width. Doing the math gives an answer of 1,425 square feet.
60 x 30 = 1,800 square feet
70' x 30' = 70*30 square feet = 2100 sq feet.
3 foot = 1 yard so 30 foot x 30 foot floor = 10 yard x 10 yard floor = 100 square yards.
30 X 15 = 450 square feet.
390 = 13 x 30
Assuming that 12 x 12 is 12" x 12" (one square foot), then 30 one-square-foot tiles would cover 30 square feet.
Guess 30 x 30 tile means a tile 30cm by 30cm i.e. approximately 1 foot by 1 foot, in which case the answer is 1 square foot.
12' x 30' = 360 square feet
475 x 10 = 4750 square feet.
30' x 12' is 360 square feet or about 33.445 square meters.
It is: 10*18 = 180 square yards
360 square feet