The mean of five numbers is 20. If one number is excluded, the mean becomes 18. What is the excluded number?

Topic: Arithmetic &amp; Percentages
Subtopic: Averages &amp; Statistics

A24

B26

C28

D30

Explanation

Sum of 5 numbers = 5 * 20 = 100. Sum of remaining 4 numbers = 4 * 18 = 72. Excluded number = 100 – 72 = 28.

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