How many feet do 5 birds and 4 rabbits have?
5只小鸟和4只小白兔共有多少只脚．
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">10 + 16</gadget>
<output>26</output>

<result>26</result>