In a vegetable field, (1/3) is used to grow cucumbers, (2/5) is used to grow tomatoes, and the rest is used to grow cabbage. What percentage of the land is used for cabbage?
一块菜地，用它的(1/3)种黄瓜，用它的(2/5)种西红柿，其余的种白菜，种白菜的地占这块地的几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) + (2/5)</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">1 - (11/15)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>