In an experimental field, (7/20) is planted with corn and (9/20) is planted with peanuts. The rest are soybeans. What percentage of the experimental field is the part of soybeans?
一块试验田，(7/20)种玉米，(9/20)种花生．其余的种黄豆，种黄豆的部分占这块试验田的几分之几？
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (7/20) - (9/20)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>