The area of a circular flowerbed is (5/6) hectare, and 3 different kinds of flowers are planted in it. Among them, peonies account for (2/5) of the total area, lilies account for (1/3) of the total area, and the rest are roses. What percentage of the total area do roses occupy?
一个圆形花圃的面积是(5/6)公顷，里面种了3种不同的花．其中牡丹占总面积的(2/5)，百合占总面积的(1/3)，其余是玫瑰．玫瑰占总面积的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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