There are 18 chickens and rabbits in total. After counting, there are 62 legs. How many chickens are there?
鸡和兔共18只，数数后发现腿有62条，则鸡有多少只．
<gadget id="calculator">4 * 18</gadget>
<output>72</output>

<gadget id="calculator">72 - 62</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>