Class 9 of the school goes to the library to borrow books. If you borrow 35 books, distribute one book to each child on average; if you borrow 56 books, distribute 2 books to each child on average; if you borrow 69 books, distribute one book to each child on average The difference is 3 books, how many children are there at most in this class?
学校九班到图书馆借图书，如借35本，平均分发给每个小朋友差一本；如借56本，平均分发给每个小朋友剩2本；如借69本，平均分发给每个小朋友差3本，这个班的小朋友最多有多少人？
<gadget id="calculator">2 * 3 * 3</gadget>
<output>18</output>

<result>18</result>