To process a batch of parts, A and B can complete it in 24 hours. Now A will work alone for 16 hours first, and then B will work alone for 12 hours, leaving (2/5) of this batch of parts unfinished. It is known that A makes 3 more parts per hour than B, so how many parts are there in this batch?
加工一批零件，甲、乙合做24小时可以完成．现在由甲先单独做16小时，然后乙再单独做12小时，还剩下这批零件的(2/5)没有完成．已知甲每小时比乙多做3个零件，那么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">(1/24) * 12</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">16 - 12</gadget>
<output>4</output>

<gadget id="calculator">(1/10) / 4</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/24) - (1/40)</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/40) - (1/60)</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">3 / (1/120)</gadget>
<output>360</output>

<result>360</result>