1. 30/9=10/3
2. 63/6=21/2
3. 35/3
4. 21/3=7
5. 63/18=7/2
6. 9/10
7. 40/21
8. 35/18
9. 32/45
10. 12/63=4/21
11. 80/15=16/3
12. 80/450=8/45
