A highway has been repaired for 750 meters, which is 30 meters shorter than that of the unrepaired one. How many meters is the unrepaired one?
修一条公路，已经修好750米，比没有修好的3倍少30米，没有修好的是多少米？
<gadget id="calculator">750 + 30</gadget>
<output>780</output>

<gadget id="calculator">780 / 3</gadget>
<output>260</output>

<result>260</result>