SSC GD Average question with solution
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The average of 11 numbers is 23. If one number is removed, the average of the remaining numbers becomes 20. What is the removed number?
- (A)23
- (B)42
- (C)53
- (D)64
Correct answer: (C) 53
Sum of all 11 numbers = 11 × 23 = 253. Sum of the remaining 10 numbers = 10 × 20 = 200. The removed number is the difference: 253 − 200 = 53.
Shortcut: Removed number = old average + (n − 1) × (old average − new average) = 23 + 10 × (3).
About this question
- Subject
- Quantitative Aptitude
- Topic
- Average
- Exam
- SSC GD
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Last reviewed on 5 Oct 2026. Spotted a mistake? See our correction policy.