A and B are doing a job together, and A’s 4-day workload is equal to B’s 3-day workload. If A alone does this job, it will take 12 days to complete it. Now A and B cooperate for 4 days. , how many days will it take for B to do the rest of the work alone?
甲、乙两人同做一件工作，甲做4天的工作量等于乙做的3天的工作量，若由甲独做这件工作需12天完成，现甲、乙两人合作4天后，剩下的工作由乙独做需几天完成？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

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

<gadget id="calculator">(1/12) + (1/9)</gadget>
<output>7/36 = around 0.194444</output>

<gadget id="calculator">(7/36) * 4</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 - (7/9)</gadget>
<output>2/9 = around 0.222222</output>

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

<result>2</result>