Solve.
-An auditorium has 30 rows with 10 seats in the first row, 12 in the second row, 14 in the third row, and so forth. How many seats are in the auditorium?
A) 1170
B) 600
C) 735
D) 1230

Question

Quizplus · Accepted Answer

The number of seats in each row increases by 2. So, the number of seats in the 30th row is 10 + (30 - 1) * 2 = 70. The total number of seats is the sum of the number of seats in each row, which is (10 + 70) * 30 / 2 = 1170.

Solve. -An Auditorium Has 30 Rows with 10 Seats in the the First