2024 AMC 12A 第 3 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。
3.
数 被写成若干个不一定互不相同的两位数之和。至少需要多少个两位数才能写出这个和？
The number is written as the sum of not necessarily distinct two-digit numbers. What is the least number of two-digit numbers needed to write this sum?
小提示：
最大的两位数是 ，所以需要不少个数
The largest two-digit number is so many numbers are needed
大提示：
，还不够； 个数能否正好达到 ？
which falls short; can numbers reach exactly
解答：
每个数至多为 ，所以 个数的和至多为 。因为 ，至少需要 个数。用 个数时，可以取二十个 和一个 ： 。因此正确答案是 B。
Each number is at most so numbers sum to at most Since at least numbers are required. With we can use twenty s and one : Thus, the correct answer is B.
其他年份的第 3 题
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