3/5-1/5 7/20-3/20 12/16-3/16 16/27-8/27 5/9-1/3 1/3-8/27 3/4- 4/7 16/27-1/9 3/5-1/3 11/12-11/18

3/5-1/5=2/5
7/20-3/20=4/20=1/5
12/16-3/16=9/16
16/27-8/27=8/27

5/9-1/3=5/9-3/9=2/9
1/3-8/27=9/27-8/27=1/27
3/4- 4/7= 21/28-16/28=5/28
16/27-1/9=16/27-3/27= 13/27
3/5-1/3=9/15-5/15= 4/15
11/12-11/18=33/36-22/36=11/36