The ratio of the number of poplars to willows in the campus is 3:5, there are 180 poplars, how many willows are there?
校园里杨树与柳树的棵数比是3：5，杨树有180棵，柳树有多少棵．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">180 / (3/5)</gadget>
<output>300</output>

<result>300</result>