Réponse:
1. 7/12
2. 3/21 + 7/21 = 10/21
3. 17/30 =0.56
4. 17/36=0.47
5. 19/35
6. 19/30
7. 8/9
8. 31/40 =0,775
9. 19/20
10. 13/24