17/20
68/80 = 34/40 = 17/20 <-----------------------------
68/20 = 17/5 or 3 and 2/5
68/9 is in its simplest form.
68/17 equals 4 in its simplest form.
16/17 is the simplest form.
68/4 = 17
32/68 = 8/17.
34/68 = 1/2
8x/68 = 2x/17
68/78 = 34/39
In its simplest form it is 68 over 1.