The school shipped 1,800 science and technology books, which is 700 books less than 2.5 times the literature and art books. How many literature and art books did the school ship?
学校运来科技书1800本，比文艺书的2.5倍少700本，学校运来文艺书多少本？
<gadget id="calculator">700 + 1_800</gadget>
<output>2_500</output>

<gadget id="calculator">2_500 / 2.5</gadget>
<output>1_000</output>

<result>1_000</result>