"Fly love, send hope with books", when "June 1st" is approaching, our school's love team needs to pack a batch of books donated by students and send them to children in poor areas (the books are the same size, and each pack of books is required to The number of volumes installed is also the same). For the first time, the Love Squad used this batch of books (4/7) to make 22 packages and 30 more books; for the second time, they packed the remaining books together with the extra change from the first time. It happened that 18 more packages were packed, so how many books are there in this batch?
"放飞爱心，书送希望"，"六一"来临之际，我校爱心小分队需要将同学们捐赠的一批图书打包后送给贫困地区的孩子们(书的大小相同，要求每包书所装的册数也相同)．第一次，爱心小分队用这批书的(4/7)，打了22个包还多了30本；第二次，他们把剩下的书，连同第一次多的零头一起打包，刚好又打了18个包，那么这批书共有多少本？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">22 + 18</gadget>
<output>40</output>

<gadget id="calculator">22 / 40</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(4/7) - (11/20)</gadget>
<output>3/140 = around 0.021429</output>

<gadget id="calculator">30 / (3/140)</gadget>
<output>1_400</output>

<result>1_400</result>