There are 11 roosters, and the number of hens is roosters (9/11), how many hens are there?
公鸡有11只，母鸡的只数是公鸡的(9/11)，母鸡有多少只．
<gadget id="calculator">9 / 11</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">11 * (9/11)</gadget>
<output>9</output>

<result>9</result>