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Question 65
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?
Solution
They toll together after every LCM(2,4,6,8,10,12) seconds = 120 seconds
In 30 min, $$\frac{30\cdot60}{120}\ =\ 15$$
15+1 = 16 times
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