Question

Anna 阿姨 $42$ 岁。Caitlin 比 Brianna 小 $5$ 岁，而 Brianna 的年龄是 Anna 阿姨的一半。Caitlin 几岁？

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?

$15$

$16$

$17$

$21$

$37$

Brianna 的年龄是 $42 \div 2 = 21$ 岁。因此 Caitlin 是 $21 - 5 = 16$ 岁。

所以正确答案是 B。

Brianna is $42 \div 2 = 21$ years old. Caitlin is therefore $21 - 5 = 16$ years old.

Thus, B is the correct answer.