There are 180 comic books in the school library, accounting for 2/9 of the total library. How many books are there in the library?
学校图书馆有连环画180本，占图书馆总数的(2/9)，图书室内共有图书多少本？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">180 / (2/9)</gadget>
<output>810</output>

<result>810</result>