The road repair team built 2,400 meters of road this year, which is 1/5 less than last year. How many meters was built last year?
修路队今年修路2400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_400 / (4/5)</gadget>
<output>3_000</output>

<result>3_000</result>