Hope Village builds a road. When 40% of the total length is repaired, the remaining length is 128 meters longer than the repaired one. How long is this road in meters?
希望村修一条公路，当修了全长的40%时，剩下的长度比已修的多128米．这条公路全长多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">128 / (1/5)</gadget>
<output>640</output>

<result>640</result>