Answer:
20/28.
Step-by-step explanation:
We subtract the numerators to get 21-1 = 20. The denominators stay the same at 28. We have. 21/28 - 1/28 = (21-1)/28
5/7
3/4 - 1/28
= 21/28 - 1/28
= 20/28
= 5/7
