# Six bells commence tolling together and roll at intervals of 2,4,6,8,10 and 12 seconds respectively.In 30 minutes how many times do they toll together.

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Hi Krishna!

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Hi Krishna!

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LCM of the numbers= 120 = 12= 6= 2 = 1=

therfore toll altogether at same time is 120sec

how many tolls in 30 minutes=1800sec=?

solution=1800*1/120=15 times

but in the question

six bells commence tolling together(first toll) and tolls at intervals of 2,4,6,8,10,12,

beginning itself tolling from.so we should consider that toll also

therfore 15 times+1 time=16 times