There are some pigeons and rabbits in the feeding ground of the zoo. Xiaodong counted, there are 12 heads and 38 legs, how many pigeons are there?
动物园喂食场有一些鸽子和兔子．小东数了数，共有12个头，38条腿，请问鸽子有多少只．
<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>