One job, A alone needs 12 days to complete, B can complete all (1/6) every day. To complete (3/4) of all the work, how many days will it take for two people to work together?
一件工作，甲独做需12天完成，乙每天能完成全部的(1/6)．要完成全部工作的(3/4)，两人合作需要几天？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

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

<gadget id="calculator">(1/12) + (1/6)</gadget>
<output>1/4 = around 0.25</output>

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

<result>3</result>