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It takes 10 people 5 days to complete a piece of work at a factory when working 2 hours a day. Working at the same pace, how many days will it take 2 people to do the same work, if they are working 5 hours a day?

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Interesting fact:

With an incredible score of 210, Kim Ung-Yong holds the Guinness World Record for the highest IQ ever. His numeracy skills are amazing and at the age of just four, he was enrolled in college courses.