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Three musical notes with frequencies 300 Hz, 400 Hz, and 500 Hz are sounded simultaneously. At which of the following years will the combined sound frequencies be heard simultaneously again?

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Three musical notes with frequencies 300 Hz, 400 Hz, and 500 Hz are sounded simultaneously. At which of the following years will the combined sound frequencies be heard simultaneously again? Answer: 100, 200, 300, 400, 500 years

Sounds repeat their cycles over time.Find the common multiples of the frequencies (or periods).Years that are multiples of the Least Common Multiple (LCM) of 300, 400, and 500, which relates to the years 100, 200, 300, 400, 500 (all multiples of 100).

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.