There are nine rows of seats with 18 seats in each row. There are also 6 rows of seats with 24 seats in each row. How many seats are there?

9 (18) + 6 (24) = 162 + 144 = 306 seats

(seatsperrow) times number of rows in section=number of seats in a section

9 rows with 18 in each so 9*18 in that section (162 seats)

6 rows with 24 in each so 6*24 in that section (144 seats)

total is 162+144=306 seats