There are 12 chickens and rabbits in the cage with a total of 38 feet, how many chickens are there
笼中一共有12只鸡和兔子，共38只脚，则鸡有多少只
<gadget id="calculator">4 * 12</gadget>
<output>48</output>

<gadget id="calculator">48 - 38</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>