A batch of parts is processed. A alone can complete it in 10 days, and B alone can complete it in 12 days. After the two work together for 1 day, A makes 40 more parts than B. How many parts are there in this batch?
加工一批零件，甲单独做10天完成，乙单独做12天完成，两人合做1天后，甲比乙多做了40个零件．这批零件共有多少个？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/10) - (1/12)</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">40 / (1/60)</gadget>
<output>2_400</output>

<result>2_400</result>