Booker owns 85 video games. He has 3 shelves to put on the games on. Each shelf can hold 40 video games. how much room dose he have room for

So if each shelf can hold up to 40 games all together he can keep 3 (40) games which is 120 games and he already has 85 video games so 120-85 will be 35. so he can keep 35 more games.