To build a road, 60% of the road has been repaired, and 840 meters have been repaired. How long is this road in meters?
修一条公路，已修的是未修的60%，已修840米，这条公路长多少米．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">840 / (3/5)</gadget>
<output>1_400</output>

<gadget id="calculator">1_400 + 840</gadget>
<output>2_240</output>

<result>2_240</result>