65% of the library books are for adults because 100 - 35 = <<100-35=65>>65

There are 160 library books in total because 104 / .65 = <<104/.65=160>>160

# Answer

160
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A library has a number of books. 35% of them are intended for children and 104 of them are for adults. How many books are in the library?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
160
A library has a number of books. 35% of them are intended for children and 104 of them are for adults. How many books are in the library?
train