Fumin Village needs to build a road. The full length (2/5) was built on the first day, and the full length (1/3) was built on the second day. What fraction of the full length is left to be repaired?
富民村要修一条公路，第一天修了全长的(2/5)，第二天修了全长的(1/3)，还剩全长的几分之几没有修？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>