Qiang's family has a vegetable plot of 40 square meters, and his mother plans to use (1/3) of it to grow peppers, (2/5) to grow eggplants, and the rest to grow beans. What percentage of the total area of the land is planted with beans?
强家有一块40平方米的菜地，妈妈计划用它的(1/3)种辣椒，(2/5)种茄子，其余的种豆角．种豆角的土地面积占这块地总面积的几分之几？
<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 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

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