Processing a batch of parts, the master alone takes 15 days to complete, and the apprentice alone takes 24 days to complete. Now the apprentice works alone for a certain number of days, and then the master works alone for 5 days to complete the task. How many days does the apprentice work alone?
加工一批零件，师傅单独做要15天完成，徒弟单独做要24天完成．现在徒弟先单独做若干天，再由师傅单独做5天才完成任务，徒弟单独做了多少天？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 5</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(2/3) / (1/24)</gadget>
<output>16</output>

<result>16</result>