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Q.

Six bells commence tolling together and toll 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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a

4

b

3

c

15

d

16

answer is D.

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Detailed Solution

Bell toll of intervals of

2,4,6,8,10,12,m14,16,18,20,22,24,26,28,30

 Including the first bell, it tolls 16 times in half and hour (on 30 minutes).

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