Poplar trees are 20% more than willow trees, and how many percent are willow trees less than poplar trees?
杨树的棵树比柳树的棵树多20%，柳树的棵树比杨树的棵树少百分之几？
<gadget id="calculator">16.7 / 100</gadget>
<output>0.167</output>

<result>0.167</result>