Xinhua Bookstore shipped a batch of books, sold 30% of the books on the first day, sold 2/5 of the books on the second day, and sold 180 more books on the first day than on the second day ． How many books are there in total?
新华书店运来一批图书，第一天卖出这批图书的30%，第二天卖出的本数是第一天的(2/5)，第一天比第二天多卖出180本．这批图书一共有多少本？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/10) * (2/5)</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">(3/10) - (3/25)</gadget>
<output>9/50 = around 0.18</output>

<gadget id="calculator">180 / (9/50)</gadget>
<output>1_000</output>

<result>1_000</result>