Think of numbers that when they are divided by 10, the remainder is 9.
So numbers like: 19, 29, 39, 49, 59, 69, 79, 89, and 99.
Now numbers that when they are divided by 9, the remainder is 8.
So numbers like: 17, 26, 35, 44, 53, 62, 71, 80, 89, and 98.
Now the number that is alike from the two sets of numbers is n.
n=89
Double check your work.
Divide 89 by 10. Remainder of 9
Divide 89 by 9. Remainder of 8.
Hope this helps :)
        
             
        
        
        
Answer:
that is the solution to the question
 
        
             
        
        
        
Answer:
15) x = 112
18) x = 120
19) x = 31
20) x = 65
Step-by-step explanation:
I hope that is useful for you :) 
 
        
             
        
        
        
You would make a table first, the top part, just start from zero and add every time. Hope this helps