The answer will depend on how many tiles per box.
24
The number of boxes that can fit in a 20-foot contain can vary a bit by the size of the boxes. Anywhere from 700 to 1000 boxes is average.
30 boxes should work. Ceramic tile normally come in boxes of 10, so you would need 240 tiles or 24 boxes. Then add 20%-30% more for cutting edges, corners, islands, closets, waste, and breakage. That would be 5 - 7 more boxes. But it is best to have a few on hand for future repairs.
It would be a 20 by 20 ft square
144 inches in one square foot. Since it is a square foot you would take 12 inches time 12 inches to get 144.
About five (4.975) such boxes.
twelve
17 and one-third.
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.
on a wall it would be 100 square feet.
24
The number of boxes that can fit in a 20-foot contain can vary a bit by the size of the boxes. Anywhere from 700 to 1000 boxes is average.
There aren't any square feet in nine feet. Square feet are 1 foot wide by 1 foot long. Nine feet is nine feet. You don't give any width or depth for someone to calculate. If you took your nine feet and cut it into one foot lengths you would be able to make two and one fourth, one square foot boxes if that's what your question is.
30 boxes should work. Ceramic tile normally come in boxes of 10, so you would need 240 tiles or 24 boxes. Then add 20%-30% more for cutting edges, corners, islands, closets, waste, and breakage. That would be 5 - 7 more boxes. But it is best to have a few on hand for future repairs.
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.
16 foot x 16 foot deck would be 256 square feet.
12 boxes, if you do not stack the boxes.