The first row in a movie theater contains 20 seats.As you move toward the back, each row has 1 additional seat.If there are 18 rows, what is the capacity of the theater?
A) 513
B) 570
C) 333
D) 522
E) 1,083

Question

The first row in a movie theater contains 20 seats.As you move toward the back, each row has 1 additional seat.If there are 18 rows, what is the capacity of the theater? 
A) 513
B) 570
C) 333
D)  522
E) 1,083

Quizplus · Accepted Answer

The first row has 20 seats. The second row has 21 seats. The third row has 22 seats, and so on. The 18th row has 37 seats. To find the total capacity of the theater, we add up the number of seats in each row: 20 + 21 + 22 + ... + 37 = 513.

The First Row in a Movie Theater Contains 20 Seats