Master Wang processed a batch of parts, and processed (1/4) of this batch of parts in the first 3 days. At this speed, how many days will it take for Master Wang to finish processing this batch of parts.
王师傅加工一批零件，前3天加工了这批零件的(1/4)，照这样的速度，王师傅加工完这批零件还需要多少天．
<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">(1/4) / 3</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(3/4) / (1/12)</gadget>
<output>9</output>

<result>9</result>