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Question

Three alarms clocks rings at interval at $$4, 12$$ and $$20$$ minute respectively. If they start ringing together after how much time will they next ring together?


Solution

Clocks will ring together again at L.C.M of 4,12,20
$$\Rightarrow LCM= 4\times 1\times 3\times 5$$
=60
$$\Rightarrow $$ clocks ring together after 60 minutes.

1194257_1379968_ans_839fb8d567c54673ac3bc39cbc33ceb9.jpg

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