To measure multiple lengths exactly using a single scale, the HCF of all the lengths gives the largest possible scale length that divides all the measurements exactly.
The greatest possible length of a scale that can be used to measure exactly 3m, 5m 40cm, and 13m is 90 cm
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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.