If the average of five numbers is 10 and one number 20 is removed, what is the new average?
Answer: 7.5
Explanation
We are given:
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Average of 5 numbers = 10
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So, total sum of the 5 numbers = 10 × 5 = 50
Now, one number (20) is removed:
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New sum = 50 − 20 = 30
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New number of values = 5 − 1 = 4
So, new average = 30 ÷ 4 = 7.5
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