Staff Selection Commission Quantitative Aptitude — Question 259

Question

The average of 5 numbers is 27. If one number is excluded, the average becomes 25. What is the excluded number?

1. 30
2. 35
3. 40
4. 45

Correct answer

B — 35

Explanation (English)

Sum of 5 numbers = 27 × 5 = 135. Sum of 4 numbers = 25 × 4 = 100. Excluded number = 135 - 100 = 35

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