The road construction team repaired a 50-kilometer long road. On the first day, they repaired the full length (1/6), on the second day they repaired the full length (1/2), on the third day they repaired the full length (1/5) , how much is left unrepaired?
修路队修一条50千米长的路，第一天修了全长的(1/6)，第二天修了全长的(1/2)，第三天修了全长的(1/5)，还剩几分之几没有修？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/6) - (1/2) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<result>2/15 = around 0.133333</result>