It takes 10 days for team A to build a road alone, 12 days for team B, and 15 days for team C. Now let the three teams work together, but team A evacuates to other construction sites midway. As a result, it took 6 days to complete the road repair. How many days has Team A worked to repair this road?
单独修一条公路，甲队要10天，乙队要12天，丙队要15天．现在让三个队合修，但中途甲队撤离到其他工地．结果一共用了6天把这条路修完．修这条路甲队工作了几天？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/12) + (1/15)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 6</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) / (1/10)</gadget>
<output>1</output>

<result>1</result>