If 1=5, 2=7, 3=9, 4=13 then 5=??

Question

If
1,4,3=13;
4,5,4=9;
5,6,5=11 and
7,7,6=7
then
9,8,7=?

Answer 1

1
Reason:in first line it was given that 1=5

Answer 2

If 1=5, 2=7, 3=9, 4=13 then 5=??

5=17

Answer 3

If 1=5
Then 5=1