It is: 9/171 = 1/19 reduced
19
3
9
1, 3, 9, 19, 57, 171.
171.4286
19
171 can be divided by each of its factors: 1, 3, 9, 19, 57 and 171
4.0714
171. (9 x 20 = 180 - 9 = 171).19 x 9 = 171
1.7812
3.42
42.75
It is 171/124 = 1.379 approx.
171 divided by 2 is 85.5