To build a road, the full length (1/6) will be built on the first day, and the full length (2/15) will be built on the second day. What fraction of the full length is left unrepaired?
修一条公路，第一天修全长的(1/6)，第二天修全长的(2/15)，还剩下全长的几分之几没有修？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 - (1/6) - (2/15)</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>