A project is completed by Team A alone in 30 days. First, teams A and B will work together for 8 days to complete this project, and the remaining team A will complete it in 10 days. How many days will it take for team B to complete this project alone?
一项工程，由甲队单独做30天完成．这项工程先由甲乙两队合做8天，余下的甲队10天完成，那么乙队单独做这项工程多少天完成？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<gadget id="calculator">(1/30) * 18</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 8</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / (1/20)</gadget>
<output>20</output>

<result>20</result>