A project, A and B cooperate to complete in 6 days (5/6). Doing it alone, the time required by A to complete (1/2) is equal to the time required by B to complete (1/3). How many days does A need to complete alone?
一项工程，甲、乙合作6天完成(5/6)．单独做，甲完成(1/2)的时间等于乙完成(1/3)所需的时间．甲单独完成需多少天．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(5/6) / 6</gadget>
<output>5/36 = around 0.138889</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/36) * (2/5)</gadget>
<output>1/18 = around 0.055556</output>

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

<result>18</result>