The ratio of the number of poplars to willows is 5:4, and the number of willows is less than that of poplars ((())/(())).
杨树与柳树棵数的比是5：4，柳树的棵数比杨树少((())/(()))．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>