2022 AMC 8 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.
Anna 和 Bella 正在一起庆祝生日。五年前，Bella 满 岁时，她收到了一只刚出生的小猫作为生日礼物。今天两个孩子和这只小猫的年龄之和为 岁。Anna 比 Bella 大几岁？
Anna and Bella are celebrating their birthdays together. Five years ago, when Bella turned years old, she received a newborn kitten as a birthday present. Today the sum of the ages of the two children and the kitten is years. How many years older than Bella is Anna?
小提示：
现在是 年后，而当时 Bella 刚满 岁。
Bella is years older now than when she turned
大提示：
先求 Bella 和小猫现在的年龄，再求 Anna 的年龄
Find Bella’s current age and the kitten’s current age before finding Anna’s
解答：
Bella 五年前 岁，所以现在 岁。
小猫五年前刚出生，所以现在 岁。
三者共有 个年龄，总和为 ，所以 Anna 的年龄是
Anna 岁，Bella 岁，所以 Anna 大 岁。
正确答案是 C。
If Bella was five years ago, then she is right now.
If the kitten was a newborn five years ago, then it is right now.
Since the sum of all ages is Anna’s age is
Since Anna is and Bella is she is years older than Bella.
Thus, the correct answer is C.
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