To process a batch of parts, A alone can complete it in 30 days, and B alone can complete this batch of parts every day (1/24). Now the two are working together, A took a break for 2 days, and B also took a few days off, so it took 17 days to complete the task, how many days did B take?
加工一批零件，甲单独做30天完成，乙单独做每天完成这批零件的(1/24)．现在两人合作，甲中途休息了2天，乙也休息了若干天，这样用了17天才完成任务，求乙休息了几天？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">17 - 2</gadget>
<output>15</output>

<gadget id="calculator">(1/30) * 15</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) / (1/24)</gadget>
<output>12</output>

<gadget id="calculator">17 - 12</gadget>
<output>5</output>

<result>5</result>