Respuesta :
The total number of tiles required to cover the countertop is 8 rows x 54 per row, i.e 432. Now, out of which, 8 groups of 4 blue tiles each need to be fixed and remaining to be of white colour tiles. So, total blue coloured tiles are: 8 x4 = 32. Thus, white tiles Ron will need is 432-32 = 400 tiles