There are chickens and rabbits living together in a cage. It is known that there are 35 heads and 96 legs. How many rabbits are there?
今有鸡、兔共居一笼，已知头共35个，腿共96条，则兔有多少只．
<gadget id="calculator">35 * 2</gadget>
<output>70</output>

<gadget id="calculator">96 - 70</gadget>
<output>26</output>

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

<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<result>13</result>