To pave a road, 6 kilometers have been paved, and the full length (3/5) has been paved. How many kilometers are left?
铺一条公路，已经铺了6千米，正好铺了全长的(3/5)，还剩多少千米．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">6 / (3/5)</gadget>
<output>10</output>

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

<result>4</result>