Question

six bells commence tolling together and toll at intervals of 2,4,6,8,10 and 12s .in 30min, how many times do they toll together

Answer 1

Time taken for them to toll together 2nd time = LCM(2,4,6,8,10,12)=120 seconds= 2 mins
So they toll 15 times in half an hour..
But wait, we should even include the first toll.
SO they toll 16 times in 30 mins

HOPE IT HELPS!!

Answer 2

In the six bell's rings at intervals of 2,4,6,8,10and12sec
In this six bell's rings together in 60sec per once
In 30 min the the bell's are ring in 30 times