It takes 6 days for A and B to complete a project together. If A works in 3 days first, and then B works in 10 days, the entire project can be completed. How many days will it take for B to complete it alone? (arithmetic method)
一项工程，甲、乙合做要6天完成，如果甲先做3天，再由乙做10天，可以全部完成，乙单独做要多少天完成？(算术方法)
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 3</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">(1/2) / 7</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">1 / (1/14)</gadget>
<output>14</output>

<result>14</result>