project can be completed by A alone for 10 days, and then by B alone for 15 days. If A and B work together, it takes 12 days to complete. Now A works alone for 8 days, and then B alone continues. How many days will it take? can be completed?
某工程由甲单独做10天，再由乙单独接着做15天可以完成，如果甲乙两人合作需12天完成，现在甲先单独做8天，然后再由乙单独接着做，还需多少天可以完成？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) * 8</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(1/12) * 10</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">(1/6) / 5</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/3) / (1/30)</gadget>
<output>10</output>

<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<result>18</result>