Xiaoming asked Uncle Wang's age this year, and Uncle Wang said: "Add 9 to my age, divide by 4, and then subtract 8, which is equal to 2". How old is Uncle Wang this year?
小明问王叔叔今年的年龄，王叔叔说："把我的年龄加上9，除以4，再减去8，等于2"．王叔叔今年多少岁．
<gadget id="calculator">2 + 8</gadget>
<output>10</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 - 9</gadget>
<output>31</output>

<result>31</result>