For a batch of saplings, Class 1 of the fifth grade planted all (1/5) of them on the first day, and planted all (1/20) more of them on the second day than on the first day, leaving a few percent of the saplings unplanted ?
一批树苗，五年级1班第一天栽了全部的(1/5)，第二天比第一天多栽了全部的(1/20)，还剩下全部的几分之几没有栽？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/5) + (1/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/5) - (1/4)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>