A road construction team repaired a section of road. The first phase of the project repaired 30% of the total length, the second phase of the project repaired 40% of the total length, and there were 900 meters left to be repaired. How many meters is this road?
某修路队修一段公路，第一期工程修了全长的30%，第二期工程修了全长的40%，还剩900米没有修．这条公路长多少米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (3/10) - (2/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">900 / (3/10)</gadget>
<output>3_000</output>

<result>3_000</result>