road long (7/8) kilometers was repaired in three days, the full length (3/8) was repaired on the first day, the full length (2/5) was repaired on the second day, and several full lengths were repaired on the third day. How much?
一条路长(7/8)千米三天修完，第一天修了全长的(3/8)，第二天修了全长的(2/5)，第三天要修全长的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">1 - (3/8) - (2/5)</gadget>
<output>9/40 = around 0.225</output>

<result>9/40 = around 0.225</result>