A and B can complete a job in 10 days, B and C can complete this job in 15 days, A and C can complete this project in 12 days, how many days can A, B and C complete this job?
甲乙两人合作10天可以完成一件工作，乙丙两人合作15天完成这件工作，甲丙合作12天可完成这件工程，甲乙丙合作几天完成这件工作？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

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

<gadget id="calculator">(1/10) + (1/15) + (1/12)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 2</gadget>
<output>1/8 = around 0.125</output>

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

<result>8</result>