A road repairing team has built 18 kilometers of roads, just repairing the full length (1/5), how many kilometers are left to be repaired?
一个修路队已经修路18千米，正好修了全长的(1/5)，还剩多少千米没有修？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">18 / (1/5)</gadget>
<output>90</output>

<gadget id="calculator">90 - 18</gadget>
<output>72</output>

<result>72</result>