Two bells ring together at 9:00 AM. One rings every 12 minutes and the other every 18 minutes. At what time will they next ring together?
- A.9:24 AM
- B.9:30 AM
- C.9:36 AM ✓
- D.9:48 AM
Explanation: The bells ring together again after the LCM of 12 and 18 minutes, which is 36 minutes — so 9:36 AM.
Class 6 IMO Mathematics Olympiad practice · Number Sense · Factors, Multiples & Primes
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