To build a road, engineering team A completes the repair in 20 days, engineering team B completes the repair in 30 days, and engineering team A works for 5 days first, and then the two teams jointly repair it. How many days will it take to complete the road?
修一条路，A工程队20天修完，B工程队30天修完，A工程队先干5天后，两队合修，还需要多少天修完这条路？
<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>

<result>9</result>