12/35:2/5=? 15/17:5=? 4:20/21=? 8 3/4:2 1/3=?

Question

12/35:2/5=?
15/17:5=?
4:20/21=?
8 3/4:2 1/3=?

Answer 1

1-  12/35*5/2=6/7
2-   15/17*1/5 = 3/17
3-  1/4*20/21=5/21
4-   35/4*3/7= 5/4*3/1=15/4=3 2/4