Question

Three alarm clocks ring at intervals of 4,12 and 20 minutes respectively. If they start ringing together, after how much time will they next ring together?


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Answer 1

Answer:

take

LCM of 4,12,20

thus LCM= 60

hence it will rang together after 60min

hope this will help you

Answer 2

Answer:

We have to do LCM of 4, 12, 20

The LCM is 60

so,

after 60 minutes the bell will ring .