The engineering team repaired a road, and repaired the full length (1/15) on the first day, and the full length (3/20) on the second day, what fraction of the full length is left unrepaired?
工程队修一条路，第一天修了全长的(1/15)，第二天修了全长的(3/20)，还剩全长的几分之几没有修？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (2/15) - (3/20)</gadget>
<output>43/60 = around 0.716667</output>

<result>43/60 = around 0.716667</result>