Answer
The total number of seats is $1470$ seats.
Work Step by Step
Seats in the first row $=25$.
Seats in the second row $=26$ and so on
Total number of seats $=25+26+27+.....35$terms.
This is the arithmetic series.
35th term $25+(35-1)1=25+34=59$
The sum of the series is
$=\frac{35}{2}(25+59)$
$=\frac{35}{2}(84)$
$=35\cdot 42$
$=1470$.
