3/13
12 over 91 can't be simplified.
50/91 is already simplified.
It is: 91/119 = 13/17 simplified
No; it is 1/7 simplified.
Since 91 and 9 don't have any common multiples, 9/91 cannot be simplified.
It is: 91/70 = 13/10 simplified
78/91 = 6/7
Yes.
21 over 24 simplified is 7/8.
No. It can be further simplified to 4/7
32 over 21 (32/21) cannot be further simplified.
7/13