Question : Directions: In the following question, select the related number from the given alternatives.
20 : 30 :: ? : 72
Option 1: 56
Option 2: 59
Option 3: 68
Option 4: 61
Correct Answer: 56
Solution :
Given:
20 : 30 :: ? : 72
In the given number pairs, add squares of consecutive numbers to itself.
Like, 20 : 30→(4)
2
+ 4 = 16 + 4 = 20; (5)
2
+ 5 = 25 + 5 = 30
Similarly, follow the same pattern for (?) : 72→(7)
2
+ 7 = 49 + 7 = 56; (8)
2
+ 8 = 64 + 8 = 72
So, 56 is related to 72. Hence, the first option is correct.
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