All four members in the family set alarm on their mobiles at interval of 5 10 15 and 20 minutes if all the move all the mobile during that time what time will the alarm ring together again
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L.C.M. of 5, 10,15,20=60
After 60 minutes or 1 hour the alarm will ring together again.
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after 1 hour the alarm rings here is your answer hope it's help
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