This is a direct work–men inverse proportion question. Total work = men × days = 15 × 12 = 180 man-days If 9 men do the work: 180 ÷ 9 = 20 days So, 9 men need 20 days.
15 men can work a do in 12 days. How long it will take 9 men to do work?
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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.