Question 1005020
Call the number of rows, r.
Call the number of seats in each row, s.
Then we have (given a rectangular auditorium)
rs = 3332 and
s = r + 19
Let us substitute the second into the first and get
r(r + 19) = 3332
r^2 + 19r - 3332 = 0
(r + 68)(r - 49) = 0
r = 49 rows of 68 seats each.