Answer:
20 3/4
Step-by-step explanation:
21 4/8 is the same as 21 2/4 or even 21 1/2, but for this equation, it would be easier to put it as 21 2/4.
Then you would just minus 21 4/8 by 3/4 which would then leave you with 20 3/4.
I hope this helped!
