A job can be completed in 6 days by A alone, 9 days by B alone, and now B does (1/3), how many days will it take for A to complete the rest?
一件工作，甲独做6天完成，乙独做9天完成，现在由乙做(1/3)，余下的甲做还要几天完成？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(2/3) / (1/9)</gadget>
<output>6</output>

<result>6</result>