Eight members of the engineering team completed (2/3) of a certain project in 30 days, and then added 4 people to complete the rest of the project, how many days did it take to complete the project?
工程队的8个人用30天完成了某项工程的(2/3)，接着增加了4个人完成其余的工程，那么完成这项工程共用了多少天．
<gadget id="calculator">2 / 3</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">(2/3) / 30 / 8</gadget>
<output>1/360 = around 0.002778</output>

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">(1/360) * 12</gadget>
<output>1/30 = around 0.033333</output>

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

<gadget id="calculator">10 + 30</gadget>
<output>40</output>

<result>40</result>