Six bells commence tolling at the intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. How many times do they toll together in an hour?
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LCM of 2, 4, 6, 8 10 and 12 is 120.
So, after each 120 seconds, they would toll together.
Hence, in 30 minutes, they would toll 30*60 seconds / 120 seconds = 15 times
But then the question says they commence tolling together. So, they basically also toll at the "beginning" ("0" second).
So, total tolls together = 15+1 = 16
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