A project is completed in 8 days jointly by A and B. If A is asked to do it alone for 6 days first, and then B is to do it alone, when the task is completed, it is found that B has 3 days more than A. How many days will it take B to complete the project alone?
一项工程，甲、乙合做8天完成．如果先让甲独做6天，再由乙独做，完成任务时发现乙比甲多了3天．乙独做这项工程要几天完成？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 6</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 3</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<result>12</result>