14/26 = 7/13

18/24 = 9/12 = 3/4

24/15 = 8/5 =1  3/5

25/35 = 5/7

81/108 = 9/12 = 3/4

30/42 = 15/21= 5/7

33/39= 11/13

45/51 = 15/17

12/60 = 1 /5

50/100 = 1/2