1/9 + 4/15 = 5/9
5/12 + 1/12 = 6/12 = 1/2
5/18 + 7/12 = 1/36 + 7/12 = 19/36
1/4 + 7/18 = 9/36 + 14/36 = 23/36
1/9 + 4/15 = 5/9
5/12 + 1/12 = 6/12 = 1/2
5/18 + 7/12 = 1/36 + 7/12 = 19/36
1/4 + 7/18 = 9/36 + 14/36 = 23/36