On Arbor Day, Dongquan Wan Elementary School planted forests on the barren hills in Xiaoao. They planned to use (2/5) of the total area to plant fruit trees, (1/3) to plant poplars, and the rest to plant pine trees. The area planted with pine trees accounted for the total area. What fraction of the area?
东泉完小在植树节那天，在小凹的荒山上造林，计划用总面积的(2/5)种果树，(1/3)种杨树，剩下的种松树，种松树的面积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>