1.

three Bells rings at an interval interval of 20 minutes 25 minutes and 30 minutes respectively if the Rings together at 11 a.m at what time they will ring together again

Answer»

To find the MINIMUM time,we have to find the LCM of 20,25,30
20=2*2*5
25=5*5
30=3*2*5
LCM =2*2*3*5*5
=300 minutes
=5 hours
therefore,at 4 p.m, they will MEET again



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