Chickens and rabbits are in the same cage. There are 24 heads and 68 feet. How many chickens are there?
鸡兔同笼，共有24个头，68只脚，鸡有多少只．
<gadget id="calculator">4 * 24</gadget>
<output>96</output>

<gadget id="calculator">96 - 68</gadget>
<output>28</output>

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

<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<result>14</result>