AMC8 2022

AMC8 2022 · Q5

AMC8 2022 · Q5. It mainly tests Arithmetic misc.

Anna and Bella are celebrating their birthdays together. Five years ago, when Bella turned $6$ 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 $30$ years. How many years older than Bella is Anna?

安娜和贝拉一起庆祝她们的生日。五年前，当贝拉6岁生日时，她收到了一只新生小猫作为生日礼物。今天，两个孩子和小猫的年龄之和是30岁。安娜比贝拉大几岁？

(A) 1 1

(B) 2 2

(D) 4 4

(E) ~5 ~5

Answer

Correct choice: (C)

正确答案：（C）

Solution

Five years ago, Bella was $6$ years old, and the kitten was $0$ years old. Today, Bella is $11$ years old, and the kitten is $5$ years old. It follows that Anna is $30-11-5=14$ years old. Therefore, Anna is $14-11=\boxed{\textbf{(C) } 3}$ years older than Bella.

五年前，贝拉6岁，小猫0岁。今天，贝拉11岁，小猫5岁。因此，安娜是 $30-11-5=14$ 岁。因此，安娜比贝拉大 $14-11=\boxed{\textbf{(C) } 3}$ 岁。

Topics

AR.015 Arithmetic misc