Chickens and rabbits are in the same cage, with 35 heads on the top and 94 feet on the bottom. Then how many rabbits are there?
鸡兔同笼，上有35只头，下有94只脚．则兔有多少只．
<gadget id="calculator">35 * 2</gadget>
<output>70</output>

<gadget id="calculator">94 - 70</gadget>
<output>24</output>

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

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<result>12</result>