AMC8每日一题（2000年真题#01）

2000 AMC 8 竞赛试题/第1题

Problem

Aunt Anna is  years old. Caitlin is  years younger than Brianna, and Brianna is half as old as Aunt Anna. How old is Caitlin?

Solution 1

If Brianna is half as old as Aunt Anna, then Briana is  years old, or  years old.

If Caitlin is  years younger than Briana, she is  years old, or .

So, the answer is 

Solution 2

Since Brianna is half of Aunt Anna's age this means that Brianna is  years old. Now we just find Caitlin's age by doing . This makes  or