The school has a labor experiment field. (2/5) of the total area are planted with vegetables, (3/8) are planted with corn, and the rest are all planted with peanuts. What percentage of the total area is the area planted with peanuts?
学校有一块劳动实验田．总面积的(2/5)种了蔬菜，(3/8)种了玉米，剩下的全部种花生．种花生的面积占总面积的几分之几？
<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>