Six bells commence tolling together and toll at intervals of 2,4,6,8,10 and 12 seconds respectively. In 30 minutes, how many times do they toll together? A) 15 b) 16 c) 17 d) 18
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Firstly find the LCM of 2,4,6,8,10,12
LCM of 2,4,6,8,10,12is 120 sec
which means that the balls will toll together in every 2 minutes
hence in 30 minute
they will toll
30/2=15 time
total 15+1=16
as they have tolled together at 0 sec
LCM of 2,4,6,8,10,12is 120 sec
which means that the balls will toll together in every 2 minutes
hence in 30 minute
they will toll
30/2=15 time
total 15+1=16
as they have tolled together at 0 sec
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