AMC8 2000
AMC8 2000 · Q1
AMC8 2000 · Q1. It mainly tests Linear equations, Arithmetic misc.
Aunt Anna is 42 years old. Caitlin is 5 years younger than Brianna, and Brianna is half as old as Aunt Anna. How old is Caitlin?
安娜阿姨42岁。凯特琳比布里安娜小5岁，布里安娜的年龄是安娜阿姨年龄的一半。凯特琳多大？
(A)
15
15
(B)
16
16
(C)
17
17
(D)
21
21
(E)
37
37
Answer
Correct choice: (B)
正确答案：（B）
Solution
If Brianna is half as old as Aunt Anna, then Brianna is $\frac{42}{2}$ years old, or $21$ years old.
If Caitlin is $5$ years younger than Brianna, she is $21-5$ years old, or $16$.
So, the answer is $\boxed{B}$
如果布里安娜的年龄是安娜阿姨年龄的一半，那么布里安娜是$\frac{42}{2}$岁，即$21$岁。
如果凯特琳比布里安娜小$5$岁，那么她是$21-5$岁，即$16$岁。
所以，答案是$\boxed{B}$
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