You would need to do 10,125/45 = n, and in which case we just solve. 
10,215/45=227, so there are 227 napkins in each box.
Hope this helps and have a nice day:)
        
             
        
        
        
9x5=45 the building would be 45 feet tall
        
                    
             
        
        
        
MAB = 360 - 255 = 105
<ADB = 1/2(mAB) = 1/2(105) = 52.5
Answer
52.5°
        
             
        
        
        
Step-by-step explanation:
Below is an attachment containing the solution.