A project is completed in 12 days by teams A and B working together. Now, Team A will do it for 18 days first, and Team B will take over from Team A for 8 days, so that all the tasks are just completed. If Team A does this project alone, how many days will it be completed?
一项工程，甲乙两队合做12天完成．现在由甲队先做18天，乙队再接替甲队做8天，这样正好完成全部任务．这项工程如果甲队独做，多少天完成？
<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">18 - 8</gadget>
<output>10</output>

<gadget id="calculator">(1/3) / 10</gadget>
<output>1/30 = around 0.033333</output>

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

<result>30</result>