There is a rectangular land, (2/5) grows cucumbers, (1/5) grows tomatoes, and the rest grows cabbage, what percentage of the land is cabbage?
有一块长方形地，(2/5)种黄瓜，(1/5)种西红柿，剩下的种白菜，白菜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>