It’s easier than you think, just don’t overthink it. You’re fine.
I think I’m right, but here;
5/6 + 2-2/3 = 3 1/2
Then you subtract how much the person used,
2-2/3 - 1-1/3 = 1 - 1/3 or 1.3333333 (repeated)
I think. It came out as a repeated decimal, but I just put it in fraction form.
I hope this helped :]