Aunt Zhang’s family has a vegetable field, in which (2/5) are planted with small green vegetables, (1/4) are planted with eggplants, and the rest are planted with cucumbers. What percentage of the land is planted with cucumbers?
张阿姨家有一块菜地，其中(2/5)种了小青菜，(1/4)种了茄子，其余的种了黄瓜．种黄瓜的面积占这块地的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

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