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The length of the year on the planet Mars is exactly 697 days. If Mars has a calendar with a 12-day week, and year 0 begins on the first day of the week, what is the next year which will begin on the first day of the week?

 Feb 9, 2019
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It will have to be an even-numbered year  since 697 * odd  will not be evenly divisible by 12

 

A little trial and error shows that the next time that the year  will begin on the first day of the week will be  Year 12

[and every 12 years after that ]

 

 

cool cool cool

 Feb 9, 2019

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