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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

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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