To build a section of road, 1200 meters have been repaired, which is 50 meters less than 5 times the unrepaired length. How long is this road in meters?
修筑一段公路，已经修好了1200米，比未修的长度的5倍少50米．这段公路全长多少米？
<gadget id="calculator">1_200 + 50</gadget>
<output>1_250</output>

<gadget id="calculator">1_250 / 5</gadget>
<output>250</output>

<gadget id="calculator">250 + 1_200</gadget>
<output>1_450</output>

<result>1_450</result>