There are 58 chickens and rabbits in total, and there are 176 legs in total. How many rabbits are there?
鸡和兔一共有58只，数一数腿有176条，其中兔有多少只．
<gadget id="calculator">4 * 58</gadget>
<output>232</output>

<gadget id="calculator">232 - 176</gadget>
<output>56</output>

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

<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<gadget id="calculator">58 - 28</gadget>
<output>30</output>

<result>30</result>