A factory wants to produce a batch of parts, and (1/8) of this batch of parts has been completed in the first three days. According to this production speed, how many days will it take to complete the remaining parts?
某工厂要生产一批零件，前三天已完成了这批零件的(1/8)，照这样的生产速度，剩下的零件需要多少天完成？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">(1/8) / 3</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(7/8) / (1/24)</gadget>
<output>21</output>

<result>21</result>