Question:
Find the missing number in the following: 5:30 :: 4: ___
Find the missing number in the following: 5:30 :: 4: ___
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$n(n+1)$ is a very common pattern in numerical reasoning.
Updated On: Jun 26, 2026
- 20
- 40
- 60
- 80
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Mathematical analogy.
Step 2: Analysis of 5:30
$5 \times 6 = 30$. Or, $5^2 + 5 = 30$.
Step 3: Apply to 4
Using $n \times (n+1)$: $4 \times 5 = 20$. Using $n^2 + n$: $4^2 + 4 = 16 + 4 = 20$.
Step 4: Conclusion
The missing number is 20. Final Answer: (1)
Mathematical analogy.
Step 2: Analysis of 5:30
$5 \times 6 = 30$. Or, $5^2 + 5 = 30$.
Step 3: Apply to 4
Using $n \times (n+1)$: $4 \times 5 = 20$. Using $n^2 + n$: $4^2 + 4 = 16 + 4 = 20$.
Step 4: Conclusion
The missing number is 20. Final Answer: (1)
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