It takes 24 days for A and B to complete the processing of a batch of parts. Now A and B work at the same time for 4 days, and B works alone for 2 days to complete (1/5) of this batch of parts. How many days will it take for A to complete the remaining tasks alone? It is known that A processes 4 more parts than B every day, how many parts are there in total?
加工一批零件，甲、乙两人合作需24天完成．现甲、乙两人同时工作4天后，乙单独工作2天，共完成这批零件的(1/5)，甲单独完成剩下的任务还需几天？已知甲每天比乙多加工4件，问这批零件共有多少个？
<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/24) * 4</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) - (1/6)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) / 2</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/24) - (1/60) - (1/60)</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">4 / (1/120)</gadget>
<output>480</output>

<result>480</result>