The age of the third person is 15 years. To find this, you first calculate the total of the three ages by multiplying the mean (15) by the number of people (3), which equals 45. Then, you subtract the ages of the two known people (10 and 20) from this total, which gives you 45-(10+20)=15.
If the mean of 3 ages is 15 and the ages of two persons are 10 and 20, what is the age of the third person?
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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.