The road repair team paved a road and paved the full length (2/5) in 4 days. How many days will it take to finish paving?
修路队铺一条公路，4天铺了全长的(2/5)，剩下还要几天铺完？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4 / (2/5)</gadget>
<output>10</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<result>6</result>