For a batch of parts, 1/4 of the total number was processed on the first day, 25% more than on the first day was processed on the second day, and 400 parts were processed in two days less than 62.5% of the total. How many more parts can be processed? mission accomplished?
一批零件，第一天加工了总数的(1/4)，第二天比第一天多加工了25%，两天加工的比总数的62.5%还少400个，还要加工多少个才能完成任务？
<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(1/4) * (5/4)</gadget>
<output>5/16 = around 0.3125</output>

<gadget id="calculator">0.625 - (1/4) - (5/16)</gadget>
<output>0.0625</output>

<gadget id="calculator">400 / 0.0625</gadget>
<output>6_400</output>

<gadget id="calculator">1 - (1/4) - (5/16)</gadget>
<output>7/16 = around 0.4375</output>

<gadget id="calculator">6_400 * (7/16)</gadget>
<output>2_800</output>

<result>2_800</result>