Two people, A and B, can work together for 10 days to complete a job. Now A and B cooperate for 1 day, and then B will do it alone for 9 days. Then, A works alone for 2 days. At this time (16/30), if the rest of the work is done by A alone, how many days did it take to complete the project?
甲、乙两个人共同合作10天，可以完成一项工作．现在甲、乙合作1天，再由乙独做9天．接着，甲独做2天，这时完成这项工作的(16/30)，如果剩下的工作由甲队独做，那么完成这项工程共用了多少天？
<gadget id="calculator">16 / 30</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">1 - (8/15)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(8/15) - (3/10)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">9 - 2</gadget>
<output>7</output>

<gadget id="calculator">(7/30) / 7</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/10) - (1/30)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(7/15) / (1/15)</gadget>
<output>7</output>

<gadget id="calculator">1 + 9 + 2 + 7</gadget>
<output>19</output>

<result>19</result>