There are 100 heads and 354 feet of chickens and rabbits in the same cage, so how many chickens are there in the cage?
鸡兔同笼共有100个头，354只脚，那么，笼中有鸡多少只．
<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<gadget id="calculator">354 - 200</gadget>
<output>154</output>

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

<gadget id="calculator">154 / 2</gadget>
<output>77</output>

<gadget id="calculator">100 - 77</gadget>
<output>23</output>

<result>23</result>