Li Yongcun plans to build a 30-kilometer asphalt road, which was completed in the first week (1/5), and in the second week (2/3). How many kilometers will be repaired in the third week to complete the task on schedule?
李永村计划修一条长30千米的柏油路，第一周修了(1/5)，第二周修了(2/3)，第三周还要修多少千米才能按期完成任务？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (1/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">30 * (2/15)</gadget>
<output>4</output>

<result>4</result>