A and B work together to process a batch of parts, and it takes 12 days to complete it. It is known that A can process (1/4) of the total in 5 days, so how many days can B alone process it?
甲乙两人合作加工一批零件，12天完成，已知甲独做5天加工完成总数的(1/4)，那么乙独做多少天能加工完成？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 5</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/12) - (1/20)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / (1/30)</gadget>
<output>30</output>

<result>30</result>