There is a project that A and B need to work together in 6 days to complete. Now two people have done it for 2 days, and the rest is done by B alone, and it took another 10 days to complete it. How many days will it take B to complete the project alone?
有一项工程，甲、乙二人共同做需要6天完成．现在两人做了2天后，剩下的由乙单独做，结果又做了10天才完成．乙单独做这项工程需要多少天完成？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) / 10</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>