If 2,6=15. 3,9=30. 4,8=34 and 5,15=78 then 6,18=?

Question

If
2,6=5
4,9=7
6,11=8
8,15=11
then
12,18=?

Answer 1

111
.
The rule is: A,B = A * B + B / A,
so 2,6 = 2*6 + 6/2 = 15
For 6,18 it is 6*18 + 18/6 = 111

Answer 2

ANSWER: 111;
RULE IS X*Y + Y/X;
SO, 6*18 + 18/6 = 108 +3 =111