?0/?? could be 90/45 or 70/35 so ?/1=2/1 using (2, 4, 5, 9) or (2, 3, 5, 7); and ??/?8=?6/?8=56/28 or 76/38 or 96/48 using (2, 5, 6) or (3, 6, 7) or (4, 6, 9). The only two sets that don't repeat any numbers are (2, 4, 5, 9) and (3, 6, 7). So the solution is 90/45=76/38=2/1.