SSC CHSL Average question with solution
AverageModerateSSC CHSL 2024
The average of 10 numbers is 47. If one number is removed, the average of the remaining numbers becomes 50. What is the removed number?
- (A)10
- (B)50
- (C)20
- (D)47
Correct answer: (C) 20
Sum of all 10 numbers = 10 × 47 = 470. Sum of the remaining 9 numbers = 9 × 50 = 450. The removed number is the difference: 470 − 450 = 20.
Shortcut: Removed number = old average + (n − 1) × (old average − new average) = 47 + 9 × (-3).
About this question
- Subject
- Quantitative Aptitude
- Topic
- Average
- Exam
- SSC CHSL 2024
- Attempts on SSC Rank
- Not attempted yet
Appears in: SSC CHSL 2024 Tier 1 Question Paper — 2 July, Shift 1
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Last reviewed on 5 Oct 2026. Spotted a mistake? See our correction policy.