The road construction team has built a road, and the repaired area is three times that of the unrepaired, and 120 meters have not been repaired. How many meters is the total length of this road?
修路队修一条公路，已修的是未修的3倍，有120米没修，这条公路全长多少米？
<gadget id="calculator">120 * 3</gadget>
<output>360</output>

<gadget id="calculator">360 + 120</gadget>
<output>480</output>

<result>480</result>