Answer:
518 
i don't know if this needs much explaining.
 
        
                    
             
        
        
        
Answer: 4.5kg = 9.9208lbs
4.5kg = 158.733oz
 
        
             
        
        
        
Answer:
Step-by-step explanation:
I would start by visually thinking out this problem. Or if you have time sketch it out. And don't forget the popcorn :) 
Then while doing this retry the problem
 
        
             
        
        
        
The two numbers are 23 and 16 and the method is shown algebraically using simultaneous equations in the photo