In order to let the students have a tidy learning environment, the school leaders decided to use the holidays to paint all the classrooms. Team A takes 20 days alone, team B takes 24 days to do it alone, team C does it alone for 30 days, team A does it for 5 days first, and the remaining three teams cooperate. How many days will it take to complete?
为了让同学们有一个整洁的学习环境，学校领导决定利用假期将所有教室都粉刷一遍．甲队单独要20天，乙队单独做要24天，丙队单独做要30天，甲队先做5天后，剩下的有三队合作，还需要多少天完成？
<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 / 24</gadget>
<output>1/24 = around 0.041667</output>

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

<gadget id="calculator">(1/20) + (1/24) + (1/30)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(3/4) / (1/8)</gadget>
<output>6</output>

<result>6</result>