Six bells commence tolling together and toll at intervals of 3, 6, 9, – McqOptions

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1.	Six bells commence tolling together and toll at intervals of 3, 6, 9, 12, 15 and 18 seconds respectively. In 30 minutes, how many times do they toll together?
A.	10 times
B.	11 times
C.	9 times
D.	12 times
Answer» C. 9 times

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