Civil Service Exam Reviewer · Basic Operations · hard

Two school bells ring every 4 and 28 minutes, respectively. If they ring together at 9:00 AM, when will they next ring together?

1. 10:52 AM
2. 9:32 AM
3. 9:28 AM
4. 9:04 AM

Answer

C. 9:28 AM

Solution

They ring together every LCM(4, 28) = 28 minutes, so next at 9:28 AM.

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