To build a canal, team A can complete it in 20 days, and team B can complete it in 30 days. After 5 days, team A transfers team B to participate in the repair in order to catch up with the progress. How many days did it take to build this canal?
修一条水渠，甲队20天可完成，乙队30天可完成，甲队修5天后为了赶进度，调乙队参加，共同修完，这条渠道修了多少天？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 5</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</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">(3/4) / (1/12)</gadget>
<output>9</output>

<gadget id="calculator">5 + 9</gadget>
<output>14</output>

<result>14</result>