Xiaoli is 8 years old this year, and her father is 38 years old this year. When her father is three times as old as Xiaoli, how old is Xiaoli?
小丽今年8岁，爸爸今年38岁，当爸爸的年龄是小丽的3倍时，小丽多少岁．
<gadget id="calculator">38 - 8</gadget>
<output>30</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<result>15</result>