I've set up a simple grid of lets say of 4 x 4, and number each tile accordingly:

0 1 2 3
0 '00''01''02''03'
1 '04''05''06''07'
2 '08''09''10''11'
3 '12''13''14''15'

I need to then find the x and the y values based on the tile number? So say I'm given tile 11, I need two equations, one to find its x value(3), and another the y value(2). I'm sure this must be pretty simple stuff, but I'm completely stuck at the moment! thanks.