An auditorium has 80 rows of seats and the number of seats per row increases at a constant rate. If there are 32 seats in the 8t
h row, and 68 seats in the 20th row, how many seats are in the last row?
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
To find how many seats in the 80th row, you need to figure out the pattern from the 8th row to the 20th row.
To do this, you can create a table showing possibilities from the 8th to the 20th.
I started with 32 at the 8th and added 2 each time.  This was only 56 by the 20th.
Then I added 3, and this got me to 68 by the 20th row.
Then you can work backwards to find how many seats in the 1st row.  I got 11.
From here you can create an equation that you could use to solve for the 80th row.
11 + 3(r - 1), where r is the number of rows.
Substitute in 80 for r.
11 + 3(80 - 1)
11 + 237
248 seats
There are 248 seats in the 80th row.
                                
             
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