The road construction team built 2,600 meters of roads this year, which is 1/5 less than last year. How many meters were built last year?
修路队今年修路2600米，比去年少修(1/5)，去年修路多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2_600 / (4/5)</gadget>
<output>3_250</output>

<result>3_250</result>