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There are 3 bells. Bell 1 rings after every 3 minutes, bell 2 after every 6 minutes & ball 3 after every 15 minutes.

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There are 3 bells. Bell 1 rings after every 3 minutes, bell 2 after every 6 minutes & ball 3 after every 15 minutes. After how many minutes will they ring together?

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After 30 Minutes.

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