A vegetable field, in which (2/5) grows cucumbers, (3/8) grows tomatoes, and the rest grows beans, what percentage of the area is planted with beans?
一块菜地，其中(2/5)种黄瓜，(3/8)种番茄，剩下的种豆角，种豆角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">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (2/5) - (3/8)</gadget>
<output>9/40 = around 0.225</output>

<result>9/40 = around 0.225</result>