Answer:
10. 5:12 or 5/12
11. 4/9 or 4:9
12. 20:9 or 20/9 or 2 2/9
13. 1/20 or 1:20
14. 5/13 _/65
= 325 = 13_
= 13_ = 325
= _ = 25
15. _ = 45
16. _ = 15
