A project can be completed by team A alone in 20 days, and team B alone can complete 1/3 of the project in 10 days, how many days will the remaining two teams work together to complete the project?
一项工程，甲队单独做20天完成，乙队单独做10天完成这项工程的(1/3)后，剩下的由两队合做几天才能完成这项工程？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/3) / 10</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">(2/3) / (1/12)</gadget>
<output>8</output>

<result>8</result>