I was sick from school today, so I didn't know how to solve 12 questions. I will show you the questions.
1. 1/7=x/28
2. 2/3=x/20
3. 2/7=x/21
4. 6/7=x/35
5. 1/10=x/30
6. 6/7=x/14
7. 3/8=9/x
8. 1/3=14/x
9. 45=20/x
10. 2/x=14/21
11. 8/x=16/18
12. 1/x=4/36