It is not possible to answer the question because you have not specified the units for 16x16. Centimetres or inches or some other units?
49 tiles
You would need 358 tiles.
25 geinus
None. No number of gray tiles will make a white tile.
81 tiles squared because if it's a square then it would be 9x9 which is 81
You would need 216 tiles if you left no space between them for grout.
49 tiles
You would need 358 tiles.
More than 20,000 tiles fit on a space shuttle.
It depends on how big your tiles are
25 geinus
None. No number of gray tiles will make a white tile.
81 tiles squared because if it's a square then it would be 9x9 which is 81
Depends on how big your tiles are! If they are 8' x 8' each, you only need one.
864, give or take a few depending on the space between the tiles.
A 12x24 tile is 2 square feet. There are 120 tiles that would be needed.
To calculate the total number of tiles needed to make a rectangle that is 4 tiles wide, you would need to consider the length of the rectangle as well. If the length of the rectangle is x tiles, then the total number of tiles needed would be 4 times x, which simplifies to 4x. Therefore, the number of tiles needed to make a rectangle that is 4 tiles wide would be 4 times the length of the rectangle.