A project is done alone, A takes 25 days to complete, and B takes 20 days to complete, A first works in 5 days and the rest will be completed by A and B in cooperation?
一项工程单独做，甲要25天完成，乙要20天完成，甲先做5天剩下的由甲乙合作还要几天才能完成？
<gadget id="calculator">1 / 4</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 / 12</gadget>
<output>1/12 = around 0.083333</output>

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

<result>9</result>