30 is related to 41 following certain logic. Following the same logic, 14 is related to 21. To which of the following numbers is 54 related, following the same logic? (Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits.)

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So the difference increases by 4 (7 to 11 to 15): So for 54, difference is 15, so related number is 54 + 15 = 69
Answer is 69.

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