It is: 2/3
They are: 33/39 = 11/13 or 22/26
11/13, 22/26
22/34, 33/51
2/11 = 4/22 = 6/33
5/11, 10/22, 20/44 and so on.
They are: 33/39 = 11/13 or 22/26
11/13, 22/26
14 over 22 21 over 33
14/22 and 21/33
20/22, 30/33
22/34, 33/51
18/22, 27/33, 36/44
6/11 = 12/22 = 18/33
2/11 = 4/22 = 6/33
11 22 33 15 30 45
7/11 = 14/22 = 21/33
11/12=22/24=33/36