There is a piece of land with an area of 3 hectares. (1/4) of the total area is used to grow vegetables, (2/5) of the total area is used to grow grain, and the remaining area is used to grow fruit trees. What percentage of the total area is the area planted with fruit trees?
有一块面积3公顷的地，用总面积的(1/4)种蔬菜，用总面积的(2/5)种粮食，其余的面积种果树．种果树的面积占总面积的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 - (1/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>