Question

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Answer 1

Answer:

16 answer

Step-by-step explanation:

Since, LCM of 2,4,810 and 12 is 120. So, after each 120 seconds, they would toll together,

Hence, in 30 minutes, they would toll

120

30×60/120

=15 times

But then the question says they commence tolling together. So, they basically also toll at the beginning. So, total tolls together =15+1=16

I hope it will help you.

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Answer 2

Answer:

$\huge\colorbox{pink}{Answer}$

16 .✔