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Five bells begin to toll together and toll respectively at intervals of 6, 7, 8, 9 and 12 seconds. After how many seconds will they toll together again ?

Five bells begin to toll together and toll respectively at intervals of 6, 7, 8, 9 and 12 seconds. After how many seconds will they toll together again ? Correct Answer 504 seconds

LCM of (6, 7, 8, 9, 12)
LCM = 3 × 2 × 7 × 4 × 3 = 504
They will toll after every 504 seconds

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