To produce a batch of parts, 2100 parts were produced in the first 6 days. According to this calculation, the remaining 2 days can be completed. How many parts are there in this batch? (proportional solution)
生产一批零件，前6天生产了2100个零件，照这样计算，余下的2天就能完成．这批零件共有多少个？(比例解)
<gadget id="calculator">2_100 / 6</gadget>
<output>350</output>

<gadget id="calculator">350 * 6</gadget>
<output>2_100</output>

<gadget id="calculator">350 * 2</gadget>
<output>700</output>

<gadget id="calculator">2_100 + 700</gadget>
<output>2_800</output>

<result>2_800</result>