The Zhangzhuang brigade built 480 meters of roads in the first week, 30 meters less than the second week, and the number of meters repaired in the third week was twice the sum of the previous two weeks. How many meters of roads were built in the third week?
张庄大队第一周修路480米，比第二周少修30米，第三修的米数是前两周修的总和的2倍，第三周修路多少米？
<gadget id="calculator">180 + 30 + 180</gadget>
<output>390</output>

<gadget id="calculator">390 * 2</gadget>
<output>780</output>

<result>780</result>