What can be placed at '?' if both sides of '::' have same relationship between numbers:
85 : 42 :: 139 : ?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 69
Find how the second number comes from the first in the given pair, then apply the same rule to 139.
Given pair: \(85=2\times42+1\), so the second number is half of (the first number − 1): \(\frac{85-1}{2}=42\)
Same rule on 139: \(\frac{139-1}{2}=\frac{138}{2}=69\)