A project can be completed by two teams, A and B, in 12 days. Now, Team A will do it for 8 days first, and Team B will continue to do it for 18 days, just to complete it. How many days will it take to complete this project if Team B does it alone?
一项工程，由甲、乙两队合做12天可以完成．现在由甲队先做8天，乙队接着做18天恰好完成．这项工程如果由乙队单独做，需要多少天完成？
<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>