In order to ensure transportation in the earthquake-stricken areas of Sichuan, a certain unit of the PLA built roads (7/20) kilometers on the first day and (11/20) kilometers on the second day. How many kilometers were built in total in two days?
为了保证四川地震灾区的交通运输，解放军某部第一天修路(7/20)千米，第二天修了(11/20)千米，两天一共修了多少千米？
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">11 / 20</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(7/20) + (11/20)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>