Total weight is found using the average. After replacing an 18 kg person with a 10 kg person, the total decreases by 8 kg, making the new average 11.5.
If 8 persons have an average of 12.5 and one person of 18 kg is replaced with 10 kg, the new average will be:
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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.