It takes 20 days for A project team alone to complete a project, and 30 days for B project team alone. If two teams work together for 10 days, how many days will it take for team B to complete the rest alone?
一项工程，甲工程队单独做需20天，乙工程队单独做需30天．如果两队合作10天，剩下的由乙队单独完成还要多少天？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/20) + (1/30)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) * 10</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) / (1/30)</gadget>
<output>5</output>

<result>5</result>