Mary and Peter work together in a factory, on the night shift. Mary has a night off every 4 days and Peter every 6 days. When their nights off coincide they go out dancing. The frequency of their dancing outings is every:
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4 days
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6 days
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8 days
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12 days
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24 days
Try to solve it before checking the answer.
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12 days
Indeed, the frequency is the least common multiple (LCM) of 4 and 6, which is 12.