There is a nursery land with an area of (5/6) hectares, of which (1/3) is planted with boxwood, (2/5) is planted with ginkgo, and the rest is planted with fir trees. What percentage of the area is planted with fir trees?
有一块面积(5/6)公顷的苗圃地，其中(1/3)种黄杨，(2/5)种银杏，其余的种杉树，种杉树的面积占总面积的几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>