If you mean the mixed fraction 1 and 21/20 It can be simplified to 21/20
Yes, 21/3 = 7/1
No, 21 over 32 cannot be reduced.
21/42 = 1/2
Yes, 1/2
Yes: 4/20 = 1/5
1/20
Yes: 1/2
1/20
1 over 5, 20 % or 0.2
20/40 can be reduced to 1/2.
5/20 reduces to 1/4
It is: 21/20 times 100/1 = 105%