Character Puzzles - General Questions

Find the missing number:

8   7   30
8   1   18
5   2   ?

Find the missing number:

5   2   21
4   1   15
2   1   ?

Find the missing number:

3   2   5
8   5   39
4   1   ?

Find the missing number:

4   3   14
2   1   6
7   6   ?

Find the missing number:

8   5   48
9   5   54
5   4   ?