Average problems involve finding the equal value of a group. When a new member is added, the total value and the number of members both change, so the new average is calculated by dividing the updated total by the new count.
The average age of 10 teachers is 25 years. If an 11th teacher aged 36 years joins, what is the new average?
Review the verified answer and explanation for this Departmental Recruitment Board of the Prime Minister’s Office (DRB) past-paper question on CampusFin.
Question context
This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the Departmental Recruitment Board of the Prime Minister’s Office (DRB) preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.