There are 8 chickens and rabbits in the cage, 26 feet, how many rabbits.
笼子里共有鸡、兔8只，数脚26只，兔多少只．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

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

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>