There are two bookshelves with a total of 1000 books. If you take out (1/4) from the first bookshelf and put them in the second bookshelf, then the second bookshelf has more books (2/9) than the first bookshelf. How many books are there in the first bookshelf? Book?
有两个书架共有1000本，如果从第一书架取出(1/4)放入第二书架，则第二书架的书比第一书架多(2/9)，第一个书架原来有多少本书？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 + 1 + (2/9)</gadget>
<output>20/9 = around 2.222222</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1_000 / (20/9) / (3/4)</gadget>
<output>600</output>

<result>600</result>