Binding a batch of books, (1/8) of these books were bound on the first day, and 1400 volumes were bound on the second day. At this time, the unbound books accounted for the total (7/12). How many volumes are there in this batch of books?
装订一批书，第一天装订了这批书的(1/8)，第二天装订了1400册．这时没装订的占总数的(7/12)，这批书一共有多少册？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">1 - (1/8) - (7/12)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">1_400 / (7/24)</gadget>
<output>4_800</output>

<result>4_800</result>