Question : Directions: In the following question, select the related number from the given alternatives.
4 : 20 :: 8 : ?
Option 1: 74
Option 2: 70
Option 3: 72
Option 4: 78
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Correct Answer: 72
Solution :
Given:
4 : 20 :: 8 : ?
Add the square of the first number to itself, to obtain the second number.
Like, 4 : 20→(4)
2
+ 4 = 16 + 4 = 20
Similarly, follow the same pattern for 8 : ?→(8)
2
+ 8 = 64 + 8 = 72
So, 8 is related to 72. Hence, the third option is correct.
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