A project, A and B jointly complete the whole project (9/40) every day, now A alone works for 3 days, and B continues to do it for 5 days, then there is still (1/8) of the whole project, and the whole project is completed How many days does it take to do it alone?
一项工程，甲乙合做每天完成全工程的(9/40)，现甲单独做3天，乙再接着做5天，这时还剩下全工程的(1/8)，全工程由乙单独做要多少天？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">9 / 40</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/40) * 3</gadget>
<output>27/40 = around 0.675</output>

<gadget id="calculator">1 - (1/8) - (27/40)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 2</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>