31 is related to 152 by certain logic. Following the same logic, 47 is related to 168. To which of the following is 66 related, following the same logic? (NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. e.g., 13 – Operations on 13 such as adding /deleting / multiplying etc., to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

The correct option is 187.

To understand the relationship between the numbers, we can analyze the mathematical difference between the numbers in each given pair:

First Pair: 31 and 152
If we calculate the difference between the two numbers:
$152-31=121$

Second Pair: 47 and 168
Applying the same difference calculation:
$168-47=121$

Logic: The logic of the relation is that the second number is obtained by adding 121 to the first number.

Following this exact same logic, we apply this rule to the number 66:
$66+121=187$

Thus, 66 is related to 187.