Question

Three bells toll at intervals of 15, 20 and 30 minutes respectively. If they tolled together at 12 noon,
when will they again toll together.

Please help
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Answer 1

Answer:

To answer this question, we must first find the LCM of 15, 20 and 30.

LCM = 60mins

since 60mins = 1 hour

therefore the bells will toll again after an hour, i.e. at 1pm.

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Answer 2

The answer to this question is actually the LCM of the given numbers.

LCM (15,20,30) = 2*2*3*5 = 60

Hence the three bells will toll together after 60 minutes or at 1 pm

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