Two workshops produced - two batches of parts, the first workshop produced 810 pieces, accounting for (3/5) of this batch of parts. How many did the second workshop produce?
两个车间生产-二批零件，一车间生产了810个，占这批零件的(3/5)．二车间生产了多少个？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">810 / (3/5)</gadget>
<output>1_350</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1_350 * (2/5)</gadget>
<output>540</output>

<result>540</result>