To process a batch of parts, team A will finish it in 10 days alone, and team B will finish it in 12 days alone. Now, teams A, B, and C will work together to complete this project in 3 days (3/4). If team C does it alone, it will take a few days Finish the project?
加工一批零件，甲队独做10天完成，乙队独做12天完成，现在由甲乙丙三队合修3天完成这项工程的(3/4)，如果丙队独做需几天完成这项工程？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/10) + (1/12)</gadget>
<output>11/60 = around 0.183333</output>

<gadget id="calculator">(11/60) * 3</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(3/4) - (11/20)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / (1/5)</gadget>
<output>15</output>

<result>15</result>