A feeding group has 78 chickens and rabbits with 200 feet in total. How many chickens are raised in the feeding group?
一个饲养组一共养鸡、兔78只，共有200只脚，饲养组养鸡多少只．
<gadget id="calculator">78 * 4</gadget>
<output>312</output>

<gadget id="calculator">312 - 200</gadget>
<output>112</output>

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

<gadget id="calculator">112 / 2</gadget>
<output>56</output>

<result>56</result>