It depends on the size of the boxes. If the boxes are one square foot, then you need 1400 of them. This obviously differs with box size.
No. 56 square feet will not cover half of it. 10 by 12 is 120 square feet. You will need just over 2 boxes.
About five (4.975) such boxes.
Depends on the shape of the 400 square foot area, and how you are using the boxes to cover it. The area of one face of a 20 inch cube is 400 square inches. There are 144 square inches in a square foot. So if the area to be covered is rectangular, its the sides are multiples of 20 inches, you could place 144 of the boxes on that rectangle to cover it. If you are talking about cutting the boxes open and using all 6 faces, that's another story. 1/6 of 144 is 24, so 24 boxes opened up have a total area of 400 square feet, but unless you are allowed to cut the boxes further into 20 inch squares, it might be difficult to get them to fit together to cover any reasonably shaped 400 square foot area.
If your tiles are really 25 square feet, you will need 7 of them to cover that area. Might as well get 8 to be safe. I don't know how many are in a box.
You will need a minimum of 16 square feet of carpet to cover that area.
A square foot will cover a square foot, regardless of the depth of the material the cover is made of.
1
1/144 of square foot
A minimum of 121 square feet. Just multiply length by width - the answer is the square footage.
Since a 12x12 tile is one square foot, then 38 12x12 tiles will cover 38 square feet.
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