Question

If
1, 3, 6=5
9, 7, 4=8
11, 14, 10=15
20, 16, 12=18
Then:
3, 6, 7=?
Show calculations surely with ans.. dear ones...

Answer 1

1+3-6=5
then first e have to add the first to digits then e have to subtract the last digit 
so, 3,6,7=2