There is a job that A alone can complete in 16 days, and B alone can complete it in 12 days. Now A has done it for a few days first, and B has done it for a few more days, taking 14 days to complete. How many days did A start working?
有一项工作，甲单独做16天完成，乙单独做12天完成．现在甲先做了几天，乙接着又做几天，共用14天完成．甲一开始做了多少天．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) * 14</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">(7/6) - 1</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/12) - (1/16)</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">(1/6) / (1/48)</gadget>
<output>8</output>

<result>8</result>