What can be placed at '?' if both side of '::' have same relationship between numbers:
85 : 42 :: 139 : ?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 69
85 : 42 :: 139 : ?
THE LOGIC FOLLOWED HERE IS :
IIND NUMBER × 2 +1 = IST NUMBER
AS
42 × 2 + 1 = IST NUMBER
84 +1 = 85
SIMILARLY
X × 2 + 1 = 139
2X = 139 - 1
2X = 138
X = 69