12)
6 * 6 = 36
36 * 2 = 72
72/3 = 24
C. 24
13)
2 (12 * 2 + 72/6 - 2) / 4
12 * 2 = 24
72/6 = 12
24 + 12 - 2 = 34
2 * 34 = 68
68/4 = 17
A. 17
