SSC CGL Average question with solution
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The average of 8 numbers is 21. If one number is removed, the average of the remaining numbers becomes 20. What is the removed number?
- (A)21
- (B)28
- (C)8
- (D)36
Correct answer: (B) 28
Sum of all 8 numbers = 8 × 21 = 168. Sum of the remaining 7 numbers = 7 × 20 = 140. The removed number is the difference: 168 − 140 = 28.
Shortcut: Removed number = old average + (n − 1) × (old average − new average) = 21 + 7 × (1).
About this question
- Subject
- Quantitative Aptitude
- Topic
- Average
- Exam
- SSC CGL
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Last reviewed on 5 Oct 2026. Spotted a mistake? See our correction policy.