a) 31
b) 15
c) 16
d) 30
Answer: a
Explanation: LCM of 4, 8, 10, 12, 15 and 20 = 120
120 seconds = 2 minutes
All the six bells will ring together in every 2 minutes
Number of times they will ring together in 60 minutes
= $$1 + \frac{{60}}{2}$$
= 31
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