Amanda is having new tile installed in her kitchen. TileAll charges a flat fee of $378.00 plus $15.00 per tile. KitchenPlus charges a flat fee of $550.00 plus $14.50 per tile. Amanda has a 10% discount coupon at KitchenPlus. If Amanda purchases x tiles, the following expression can be used to model the average cost per tile at KitchenPlus. (blank ) ÷ (blank) How many tiles does Amanda have to order for the average cost per tile to be equal at both TileAll and KitchenPlus? (blank)