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There are two bells in the school. Bell A rings every 7 minutes. Bell B rings every 6 minutes. If both bells ring together at 8.05 p.m., when will they ring together again?

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Answer:

Bell A rings every 7 minutes

Bell B rings every 6 minutes

Bell A and B rings together at 8:05p.m.

Question: When will they ring together again?

first, find the LCM of 7 and 6

7 - 7, 14, 21, 28, 35, 42, 49

6 - 6, 12, 18, 24, 30, 36, 42, 48

The LCM of 7 and 6 is 42

Therefore, Bell A and Bell B will ring together again in 42 minutes or 8:47p.m

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