A and B work together to process a batch of parts, and A does (3/5) when the work is completed. If A's work efficiency increases by 20%, B's work efficiency increases by 25%. When A made (2/5) of all parts. There are still 580 parts that have not been made. How many parts are there in this batch?
甲乙两人共同加工一批零件，完工时甲做了(3/5)．如果甲的工作效率提高20%，乙的工作效率提高25%．当甲做了全部零件的(2/5)时．还有580个零件没有做，这批零件有多少个？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 / 36</gadget>
<output>25/36 = around 0.694444</output>

<gadget id="calculator">(2/5) * (25/36)</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">1 - (2/5) - (5/18)</gadget>
<output>29/90 = around 0.322222</output>

<gadget id="calculator">580 / (29/90)</gadget>
<output>1_800</output>

<result>1_800</result>