A project is completed in 8 days by the cooperation of A and B, and the work efficiency ratio of A and B is 3:2. If the project is completed by B alone, how many days will it take?
一项工程，甲乙合作8天完成，甲乙工作效率比是3：2，如果工程由乙独自完成，需要几天？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/8) * (2/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / (1/20)</gadget>
<output>20</output>

<result>20</result>