Xiaogang’s family raises 72 chickens, ducks and geese in total, of which 27 are chickens, and geese account for 1/4 of the three kinds of poultry. What percentage of the three types of poultry do ducks account for?
小刚家养鸡、鸭、鹅三种家禽一共72只，其中鸡有27只，鹅占三种家禽的(1/4)．鸭占三种家禽的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">72 * (1/4)</gadget>
<output>18</output>

<gadget id="calculator">72 - 27 - 18</gadget>
<output>27</output>

<gadget id="calculator">27 / 72</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>