A road with a length of 100 meters, its (2/5) was repaired on the first day, and its (1/4) was repaired on the second day, what percentage is left unrepaired?
一条长100米的公路，第一天修了它的(2/5)，第二天修了它的(1/4)，还剩几分之几没有修？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 4</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>