There are 15 roosters and 3 times as many hens as males. How many roosters and hens are there altogether?
公鸡有15只，母鸡的只数是公的3倍，公鸡和母鸡一共有多少只．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 15</gadget>
<output>60</output>

<result>60</result>