Dongfang Grinding Wheel Factory processed a batch of grinding wheels, completed (1/5) of the total task in the first week, and completed (1/6) more of the total task in the second week than in the first week, how much is left unfinished?
东方砂轮厂加工一批砂轮，第一周完成总任务的(1/5)，第二周比第一周多完成总任务的(1/6)，还剩下多少没有完成？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) + (1/6)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">1 - (1/5) - (11/30)</gadget>
<output>13/30 = around 0.433333</output>

<result>13/30 = around 0.433333</result>