Which has a x=5 as the solution

If you could answer these your a life saver

Great freights a local shipping company, bases its charges on the weight of the items being shipped. in addition to changing 0.40$ per pound, great freights also charges a one-time fee of 10$ to set up a customers account.

Barbara is tiling her craftroom floor with square tiles.she wants 6/10 of the square tiles to be red.if she used 18 red tiles,how many square tileswill be used to cover the floor?