2+ 3 =8
3 + 7 = 27
4 + 5 = 32
5 + 8 = 60
6 + 7 = 72
7 + 8 = ? ?
it's a tricky one, but it has a solution.
show your work.

Formula: a + b = c × a - a

2+3 = 5
5 × 2 = 10 
10 - 2 = 8 

3 + 7 = 10
10 × 3 = 30
30 - 3 = 27

4 + 5 = 9 
9 × 4 = 36 
36 - 4 = 32

5 + 8 = 13
13 × 5 = 65
65 - 5 = 60

6 + 7 = 13 
13 × 6 = 78
78 - 6 = 72

7 + 8 = 15
15 × 7 = 105
105 - 7 = 98 

7 + 8 = 98

Ibelieve the answer is b