Xinhua Bookstore bought a new batch of children's books, sold 2/7 of the total number on the first day, and sold 200 more books on the second day than on the first day, a total of 5,000 books were sold in two days. How many books are there in this new batch of children's books?
新华书店新进了一批儿童读物，第一天卖出总数的(2/7)，第二天卖出的书是第一天的2倍还多200本，两天共卖出5000本．新进的这批儿童读物共有多少本？
<gadget id="calculator">5_000 - 200</gadget>
<output>4_800</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">4_800 / 3 / (2/7)</gadget>
<output>5_600</output>

<result>5_600</result>