How many of you can solve this simple question ?

India
September 15, 2006 5:27am CST
Six bells commence tolling together and toll at intervals 2,4,6,8,10 and 12 seconds respectively. In 30 minutes how many times they toll together?
1 response
kajagoogoo
@kajagoogoo (7)
• India
15 Sep 06
The Least Common Multiple(L.C.M) of 2,4,6,8,10,12 = 120 So they toll together after every 120 seconds i.e. 2 minutes. So in 30 minutes they toll together 30/2 + 1 = 16 times (1 is added because they commence tolling together)