There are 12 books on a shelf 5 of these books are new the rest are used what is the ratio of new books to used books 
       
      
                
     
    
     
    
    
    2  answers:
            
               
               
                
                
Answer: 
2.4
Step-by-step explanation: 
also known as 12/5 
the ratio of new books to be use is 12/5
 
                                
             
                    
               
               
                
                
Answer: 
5:7
Step-by-step explanation: 
Basically you first find the amount of the books are the shelf knowing that you have 5 new books, you subtract the amount of new books from total books. And 5:7 can't be simplified any further making 5:7 the answer.
 
                                
             
         	
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n/5 = -1/5
5n = -5
<u>n = -1</u> 
n - 13 = -12
n = -12 + 13
<u>n = 1</u> 
n + 15 = -10
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<u>n = -1/5</u> 
 
        
                    
             
        
        
        
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