Six hundred two thousand hundred seven.
        
                    
             
        
        
        
Answer: 
Step-by-step explanation:
 
        
                    
             
        
        
        
Let number of  books by astrid's = x
Out of x , 84% are fiction.
So, Number of non fictional books = x - 
                                        =  
→Ratio of number of  books to  fictional books 
                                       ⇒[Dividing numerator and denominator by 4.]
⇒[Dividing numerator and denominator by 4.]
→Out of 25 books by astrid 21 are fictional. 
→ Number of fictional books by astrid = 
 
        
                    
             
        
        
        
Answer:
You would divide 1442 by 77 Giving you C=18.7
Hope this helped ^^
If not sorry ¯\_(ツ)_/¯