Answer:
1900 seats
Step-by-step explanation:
See the attached worksheet. A spreadsheet is set up to subtract 20 seats from the next higher row starting with row 10 (280 seats).
Row 9 = 280 - 20 = 260 seats.
Row 8 = 260 - 20 = 240 seats
Row 7 = 240 - 20 = 220 seats
Etc
Add the total seats to arrive at 1900 seats for the auditorium.
