Question:
The average of 5 numbers is 20. If a number 10 is removed, what is the new average?
The average of 5 numbers is 20. If a number 10 is removed, what is the new average?
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For average problems, compute total sum, adjust for removed/added numbers, and recalculate.
Updated On: Jul 31, 2025
- 22.5
- 23.75
- 25
- 26.25
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The Correct Option is A
Solution and Explanation
- Step 1: Total sum. Average = 20, 5 numbers. Sum = $5 \cdot 20 = 100$.
- Step 2: Remove number. New sum = $100 - 10 = 90$.
- Step 3: New average. 4 numbers remain. Average = $\frac{90}{4} = 22.5$.
- Step 4: Verify. Original sum = 100, remove 10, new average = $\frac{90}{4} = 22.5$.
- Step 5: Conclusion. Option (1) 22.5 is correct.
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