A project can be completed by team A alone in 20 days, team B alone in 30 days, team C alone in 24 days, and teams A, B, C and C in cooperation, how many days can it be completed?
一项工程，甲队单独做20天完成，乙队单独做30天完成，丙队单独做24天完成，甲乙丙三队合做，多少天可以完成？
<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 / 24</gadget>
<output>1/24 = around 0.041667</output>

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

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

<result>8</result>