A) 7
B) 8
C) 9
D) 11
Correct Answer: B
Solution :
L.C.M. of 6, 5, 7, 10 and 12 is 420 i.e. 420 seconds or 7 minutes. Thus in 60 minutes, the bells will toll together \[60\div 7\]i.e. 8 times excluding the one at the start.
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