31/21 - 3/14
6/7 + 8/3
3/4 + 3/10
3/5 + 3/15 - 3/10
3/4 + 2/5 + 1/6
7/9 + 15/ 15
3/5 - 1/3
5/6 - 3/8
79/60
53/42
4/15
15/30
11/24
41/45
21/20
74/21
