Civil Service Exam Reviewer · Basic Operations · hard
Two school bells ring every 15 and 20 minutes, respectively. If they ring together at 9:00 AM, when will they next ring together?
- 10:00 AM
- 2:00 PM
- 9:35 AM
- 9:05 AM
Answer
A. 10:00 AM
Solution
They ring together every LCM(15, 20) = 60 minutes, so next at 10:00 AM.
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