17/80 = 0.2125
68/80 = 34/40 = 17/20 <-----------------------------
34/80 = 17/40
17, as it is, will do perfectly well.
17/20 = 85%
0.5882
0.34
17/80 is in its simplest form.
17/80 = 0.2125
68/80 = 34/40 = 17/20 <-----------------------------
80/340 = 4/17
34/80 = 17/40
.8
80/170 = 8/17
17, as it is, will do perfectly well.
17/20 = 85%
as 17/80, that is as simple as it gets. Unless 0.21 is more simple or 21% as another suggestion