six balls commence tolling together and tollat intervals of 2,4,6,8 and 10 and 12 seconds.in 30 minutes,how many times do they toll together?

• First of all it should be *BELLS not BALLS
  
  Answer:
  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 30/2+ 1 = 16 times.
  
• 10 years agoHelpfull: Yes(2) No(2)
• 15 times
  with the intervals of 2,4,6,8 and 10 and 12, bells toll together at 120 sec=2 min
  (As l.c.m of these numbers=120)
  So in 30 minutes,they toll together=30/2=15 times
  
• 10 years agoHelpfull: Yes(1) No(0)
• as the ball are commencing together so it will meet again after in every
  LCM(2,4,6,8,10,12)=120 sec;
  so,no. of meet=(30*60)/120=15 times
• 10 years agoHelpfull: Yes(1) No(0)
• it will meet in every
  LCM(2,4,6,8,10,12)=120 sec;
  no. of meet=(30*60)/120=15 times
• 10 years agoHelpfull: Yes(1) No(0)