It is: 72/171 = 8/19 simplified
91/72 is already in simplest form unless you want to write a mixed number, which would be 1 and 19/72
72 is an integer so the simplified fraction is 72/1
47/72 is already simplified
27/72 simplified is 5/18
163
It is: 72/96 = 3/4 simplified
-13/72 cannot be simplified.
55/72
Simplified - it's 1/2
-53
If you mean 68/72 then it is 17/18 when simplified