Correct option is C
The multiple of all outsider digits is equal to the multiple of insider digits:
Figure 1: 3 2 5 3 = 90 15 6 = 90.
Figure 2: 2 16 4 = 48 12 4 = 48.
Figure 3: 2 243 = 48 ? 4 = 48.
? 48 4
? 12
Thus, the correct answer is (c) 12.







