To build a 1,500-meter-long road, (1/4) of the entire project was completed in the first week, (2/5) of the entire project was completed in the second week, and all tasks were completed after repairing a fraction of the entire project ?
修一条1500米长的路，第一周完成了全工程的(1/4)，第二周完成了全工程的(2/5)，再修全工程的几分之几就完成了全部任务？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>