Chickens and rabbits are in the same cage. There are 18 heads and 44 legs. How many chickens are there?
鸡兔同笼，共有18个头，44条腿，其中鸡有多少只．
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">44 - 36</gadget>
<output>8</output>

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

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">18 - 4</gadget>
<output>14</output>

<result>14</result>