A certain project started with 6 people who completed 1/3 of the whole project in 35 days. After that, 6 people were added to complete the project together. How many days will it take to complete the project.
某项工程，开始由6人用35天完成了全部工程的(1/3)，此后，增加了6人一起来完成这项工程．则完成这项工程共用多少天．
<gadget id="calculator">1 / 3</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">(1/3) / 6 / 35</gadget>
<output>1/630 = around 0.001587</output>

<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<gadget id="calculator">(1/630) * 12</gadget>
<output>2/105 = around 0.019048</output>

<gadget id="calculator">(2/3) / (2/105)</gadget>
<output>35</output>

<gadget id="calculator">35 + 35</gadget>
<output>70</output>

<result>70</result>