It takes 8 days for the master to process a batch of parts, and 10 days for the apprentice to do it alone. Now the master and the apprentice are doing it together. The master has a meeting in the middle and asks for a day off. How many days will the apprentice do after finishing this batch of parts?
加工一批零件，师傅独做要8天完成，徒弟独做要10天完成，现由师徒一起做，中途因师傅开会请假1天，做完这批零件徒弟做几天？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/10) / (9/40)</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>