163
12 over 91 can't be simplified.
50/91 is already simplified.
It is: 91/119 = 13/17 simplified
47/72 is already simplified
It is: 72/96 = 3/4 simplified
-13/72 cannot be simplified.
No; it is 1/7 simplified.
55/72
Since 91 and 9 don't have any common multiples, 9/91 cannot be simplified.
It is: 91/70 = 13/10 simplified
No.