A project can be completed in 12 days by the cooperation of teams A and B. It is known that the working efficiency ratio of teams A and B is 3:2, how many days will it take for A to complete this project alone?
一项工程，甲乙两队合做12天能完成．已知甲乙两队的工作效率比是3：2，问甲单独完成这项工程需要多少天？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

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

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(1/12) * (3/5)</gadget>
<output>1/20 = around 0.05</output>

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

<result>20</result>