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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?

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? Correct Answer 15

The L.C.M of 2, 4, 6, 8, 10, 12 = 120 So, after 120 seconds later they toll together. Now, At 120 seconds toll it 1 times At 1 seconds toll it 1/120 times At 1800 seconds toll it ( 1800/120) = 15 times

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