The average of seven numbers is 18 If one of the…

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The average of seven numbers is 18. If one of the numbers is 17 and if it is replaced by 31, then the average becomes :

  1. A. 21.5
  2. B. 19.5
  3. C. 20
  4. D. 21

Answer: Option C

Here is complete explanation of The average of seven numbers is 18 If one of the….

Solution(By ExamCraze Team)

According to the question,
Actual number = 17
New number = 31
Difference = 31 - 17 = 14
Difference '14' effects the seven numbers = $$frac{14}{7}$$ = 2
∵ Present average = 18
∴ New average = 18 + 2 = 20

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