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The mean of five numbers is 18. If one number is excluded, then their mean is 16, the excluded number is _____?

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The mean of five numbers is 18. If one number is excluded, then their mean is 16, the excluded number is _____? Answer: 26

Mean of 5 numbers =18 ⇒ Sum of these 5 numbers =18×5=90 Let number that has been excluded be x New mean = 4 90−x ​ =16 Solving this, we get 90−x=64 ∴x=26

Question context

This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.