There are 171 white swans overwintering in a certain lake area in my country this year, 9 times that of white cranes. How many white cranes are there?
今年在我国某一个湖区越冬的白天鹅有171只，是白鹤的9倍，白鹤有几只？
<gadget id="calculator">171 / 9</gadget>
<output>19</output>

<result>19</result>