9. 5/10
10.3/4
11. 10/12
12. 1/2
13. 10/10=1/1
14. 3/4=6/8
15. 1/2=3/6
16. 3/5=6/10
17.2/3
18.1/5
19.2/6
20.6/10
The sum of all exterior angles will always add up to 360
Given equation is :
=0
Taking out
common we get,
=0
Now solving this we get,
As 11 is not factor-able, we will solve it using the formula,

a=1 b=5 and c=-11
we get,
and 