project can be completed in 6 days alone, B can be completed in 8 days alone, C can complete 1/4 of the project in 3 days, and the remaining days can be completed by A, B, and C together.
一项工程甲独做6天完成，乙独做8天完成，丙先做了3天结果完成这项工程的(1/4)，余下由甲、乙、丙三人合做需几天．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) / 3</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/6) + (1/8) + (1/12)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/4) / (3/8)</gadget>
<output>2</output>

<result>2</result>