project can be completed by team A alone in 8 days and by team B in 6 days alone. If team B does (1/4) first, and then teams A and B cooperate, how many days will it take to complete?
一项工程，甲队单独做要8天完成，乙队单独做要6天完成．如果乙队先做(1/4)后，再由甲、乙两队合作，还要几天完成？
<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 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/8) + (1/6)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">(3/4) / (7/24)</gadget>
<output>18/7 = around 2.571429</output>

<result>18/7 = around 2.571429</result>