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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.

Hi Krishna!
do you want the explanation or not



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30 minutes             = 1800=  180=  90=  30=  15=       15
LCM of the numbers= 120 =   12=   6=    2  =   1=

Answer is= 15

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Its confusing!
And also ur answer is wrong the answer is 16times!
First take lcm of 2,4,6,8,10,12=120
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
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