To build a road, 40% of the total length has been repaired in the first phase, and 30% of the total length has been repaired in the second phase, leaving 750 meters unrepaired. How many meters is this road?
修一条路，第一期工程修了全长的40%，第二期工程修了全长的30%，还剩750米没有修．这条路长多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">750 / (3/10)</gadget>
<output>2_500</output>

<result>2_500</result>