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2018 AMC 10AProblem 3P1-10~2 minPrint
Clocks, Calendars & TimeDivisibility & FactorsSet up the equation/formula and compute; no special trick needed

A unit of blood expires after 10!=10⋅9⋅8⋯110!=10\cdot 9 \cdot 8 \cdots 1 seconds. Yasin donates a unit of blood at noon of January 1. On what day does his unit of blood expire?

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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.