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?

• here every 2 min means 120sec toll
  so there are ((30/2)+1)=16
• 13 years agoHelpfull: Yes(20) No(6)
• 
  ans=15
  take LCM of all intervals;i.e. 120 secs.....
  it means they toll together after every 120 secs.
  so in 30 mins they will toll together 15 times.
• 13 years agoHelpfull: Yes(15) No(30)
• L.C.M. of 2, 4, 6, 8, 10, 12 is 120.
  
  So, the bells will toll together after every 120 seconds(2 minutes).
  
  In 30 minutes, they will toll together 30 + 1 = 16 times.
  2
  
  
• 9 years agoHelpfull: Yes(9) No(0)
• Take LCM of 2,4,6,8,10,12 seconds
  the outcome is 120seconds.
  that means at every 2mins interval bells rings together.
  in 30mins it will ring 15times together
  in 0th second all bells rings together.
  so ans is 15+1=16.
• 8 years agoHelpfull: Yes(6) No(0)