There are 550 poplar trees in the campus, less than willow trees (1/6). How many willow trees are there?
校园里有杨树杨树550棵，比柳树少(1/6)．柳树有多少棵？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">550 / (5/6)</gadget>
<output>660</output>

<result>660</result>