The master worker repaired a 1,500-meter-long canal, and after repairing a section, there were still 730 meters left. How many kilometers has the master worker repaired? (column equation solution)
工人师傅修一条长1500米的水渠，修了一段后还剩下730米．工人师傅已经修了多少千米？(列方程解答)
<gadget id="calculator">1_500 - 730</gadget>
<output>770</output>

<result>770</result>