A road has been built for 2,400 meters, accounting for exactly 40% of the total length. How many meters are left to be repaired?
修一条路，已经修了2400米，正好占全长的40%，还剩多少米没有修？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2_400 / (2/5)</gadget>
<output>6_000</output>

<gadget id="calculator">6_000 - 2_400</gadget>
<output>3_600</output>

<result>3_600</result>