A clock strikes at intervals of 5, 7, 10, and 12 seconds. If the same intervals continue, how many strikes occur in one hour, excluding the first strike?
- 5
- 6
- 8
- 9
Explanation
LCM of 5, 7, 10, 12 = 420 seconds
1 hour = 3600 seconds
Number of complete intervals:
3600 ÷ 420 = 8.57
Since the first strike is excluded, the number of complete strikes is 8.
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