To build a road with a length of 1,800 meters, the full length (2/15) was repaired in the first week, and the full length (3/20) was repaired in the second week. What fraction of the entire project can be completed?
修一条长1800米的公路，第一周修了全长的(2/15)，第二周修了全长的(3/20)，再修全工程的几分之几就可以完成任务？
<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>