Answer: 35 more video games
Explanation:
Booker owns 85 video games.
If he has three shelves that can each hold 40 video games, we subtract 40 from 85.
85-40 = 45.
We can see that Booker still has more video games.
So we subtract 40 again.
45-40= 5.
And we get 5 extra video games.
Now Booker has two full shelves of video games.
Since the last shelf can hold 40 video games, he puts the last 5 on there.
Which subtracts 5 video games from 40 shelve spaces.
40-5=35!
So Booker has room for 35 more video games.