Six bells start ringing together and ring at intervals of 4, 8, 10, 12 – McqOptions

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1.	Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times will they ring together in 60 minutes ?
A.	1
B.	5
C.	6
D.	0
Answer» B. 5

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