Correct Answer - Option 2 : 4 ∶ 16

The logic is:

6 : 54 → 5 + 4 = 9 and 9 - 6 = 3

Similarly,

4 : 16 → 1 + 6 = 7 and 7 - 4 = 3

Hence, ‘**4 : 16**’ is the correct answer.

**Other solution-**

6 ∶ 54 → 54 is completely divisible by 6

Similarly;

4 : 16 → 16 is completely divisible by 4.