2016 AMC 12B 第 5 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
5.
年战争于 年六月 日星期四宣战开始。结束战争的和平条约在 天后，即 年十二月 日签署。条约是在星期几签署的？
The War of started with a declaration of war on Thursday, June The peace treaty to end the war was signed days later, on December On what day of the week was the treaty signed?
星期五
Friday
星期六
Saturday
星期日
Sunday
星期一
Monday
星期二
Tuesday
小提示：
星期每 天循环一次，所以把 对 取余。
Days of the week repeat every days, so reduce modulo
大提示：
，所以从星期四往后数 天。
so count days forward from Thursday
解答：
因为 ，条约签署日比星期四晚 个整周再加 天。
星期四后两天是星期六。所以正确答案是 B。
Because the treaty was signed full weeks plus days after Thursday. Two days beyond Thursday is Saturday.
Thus, the correct answer is B.
其他年份的第 5 题
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