The factory processes a batch of parts, 20% of the total number is processed on the first day, and 15% of the total number is processed on the second day. A total of 2,800 parts are processed in two days. How many parts are there in this batch?
工厂加工一批零件，第一天加工总数的20%，第二天加工总数的15%，两天共加工2800个，这批零件共有多少个？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(1/5) + (3/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">2_800 / (7/20)</gadget>
<output>8_000</output>

<result>8_000</result>