There are many different books in the ' crazy silly school ' series. If you have read 17 of the books and are yet to read 15 books How many books are there in the ' crazy silly school ' series?
There are many different books in the ' crazy silly school ' series. 

If you have read 17 of the books and are yet to read 15 books 

How many books are there in the ' crazy silly school ' series?

There are a total of 32 books in the ' crazy silly school ' series.