Dad is 32 years old this year, Xiaohua is 5 years old this year, how many years later, Dad's age is 4 times that of Xiaohua.
爸爸今年32岁，小华今年5岁，多少年后，爸爸的年龄是小华的4倍．
<gadget id="calculator">32 - 5</gadget>
<output>27</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<result>4</result>