Question
Select the option that is related to the third number
in the same way as the second number is related to the first number, and the sixth number is related to the fifth number. 23 : 36 :: 42 : ? :: 51 : 77Solution
The second number in each pair is obtained by taking the first number and adding the sum of the squares of its individual digits. (23 : 36) → 23 + (2² + 3²) → 23 + 4 + 9 = 36 Third Pair (51 : 77) → 51 + (5² + 1²) → 51 + 25 + 1 = 77 Middle Pair (42 : ?) → 42 + (4² + 2²) → 42 + 16 + 4 = 62
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