?? = 16
You take the first number in each row, starting from the left and multiply that number by 4. This new value then gets placed into the cell to the right of it. Then you take that cell value and subtract 4, which leaves you with a new value that gets placed in the right most cell.
Example:
Top left cell = 3
Middle Cell = 3 x 4 = 12
Right Cell = 12 - 4 = 8
RE: Daily quiz #009 - Don't be confused