(2/5) of a field grows tomatoes, (1/5) grows eggplants, and the rest grows cucumbers. What percentage of the land is the cucumbers?
一块地的(2/5)种西红柿，(1/5)种茄子，其余的种黄瓜，黄瓜地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 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (2/5) - (1/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>