There are 120 chickens and rabbits, and the chicken has 120 more legs than the rabbit, so how many chickens are there?
鸡与兔共有120只，鸡比兔多120只脚，则鸡有多少只．
<gadget id="calculator">480 + 120</gadget>
<output>600</output>

<gadget id="calculator">2 + 4</gadget>
<output>6</output>

<gadget id="calculator">600 / 6</gadget>
<output>100</output>

<result>100</result>