To build a road, Team A completed the repair in 12 days alone, and Team B completed the repair in 16 days alone. After Team A repaired it alone for a few days, Team A and Team B jointly completed the repair in 6 days. How many days did Team A spend alone?
修一条公路，甲队单独修12天完成，乙队单独修16天完成，甲队先单独修若干天后，甲、乙两队合修6天完成，甲单独修了几天？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

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

<gadget id="calculator">(1/12) + (1/16)</gadget>
<output>7/48 = around 0.145833</output>

<gadget id="calculator">(7/48) * 6</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 - (7/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) / (1/12)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>