AMC 10 Step by Step
2010 AMC 10BProblem 5P1-10~2 minPrint

A month with 3131 days has the same number of Mondays and Wednesdays. How many of the seven days of the week could be the first day of this month?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.