garment factory processes a batch of suits. It processes 25% of the total number on the first day, 1/3 of the total number on the second day, and 840 sets on the third day. How many suits are there in this batch?
某服装厂加工一批西服，第一天加工总数的25%，第二天加工总数的(1/3)，第三天加工840套，刚好加工完，这批西服共有多少套？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/4) - (1/3)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">840 / (5/12)</gadget>
<output>2_016</output>

<result>2_016</result>