To build a road, 39 kilometers have been repaired, and the rest is twice as much as the repaired one. How many kilometers is the total length of this road?
修一条公路，已经修好了39千米，剩下的比修好的多2倍，这条公路全长多少千米？
<gadget id="calculator">2 + 1 + 1</gadget>
<output>4</output>

<gadget id="calculator">39 * 4</gadget>
<output>156</output>

<result>156</result>