9 + 7 = 16
6 + 7 = 13
16 + 13 = 29
29 + 25 = 54
1 + 54 = 55

1 + 6 = 7
25 - 7 = 18
18 - 7 = 11
11 + 7 = 18
9 x 18 = 162