Master Li processed a batch of parts. On the first day, he processed 30% of this batch of parts. If he processed 40 more parts, the number of processed parts was the same as that of unprocessed parts. How many parts are there in this batch?
李师傅加工一批零件，第一天加工了这批零件的30%，如果再加工40个，这样加工数量与未加工的同样多，这批零件共有多少个？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 / (1/5)</gadget>
<output>200</output>

<result>200</result>