Use a computer to type a manuscript, alone, Li Gang needs 5 hours to complete, Wang Ming needs 6 hours to complete, and the two of them work together for 2 hours, what fraction of this manuscript is left unfinished?
用电脑打一篇稿子，单独打，李刚要5小时完成，王明要6小时完成，两人合打2小时，还剩下这篇稿件的几分之几没有完成？
<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">(11/30) * 2</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">1 - (11/15)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>