42 is related to 36 following a certain logic. Following the same logic, 57 is related to 144. Which of the following numbers is related to 81 using the same logic?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 45.
42 is related to 36: (4 + 2)2 = (6)2 = 36
57 is related to 144: (5 + 7)2 = (12)2 = 144
Similarly, x is related to 81
4. 45: (4 + 5)2 = (9)2 = 81