An Ordinary Theatre
Algebra
Level
2
In the theatre, the number of seats in every row is four more than the number of seats of the preceding row. If there are 30 seats in the first row, what is the total seating capacity of the theatre if there are 30 rows?
The answer is 2640.
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1 solution
Seats in the 1st row = 30
Seats in the 30th row = (30 + (30 - 1)(4)) = 146
Total seats in 30 rows = (30/2)(30 + 146) = 2640 (Ans.)