Answer:
6
Step-by-step explanation:
Let the number of seats in one row be [tex]x[/tex], then the number of rows will be [tex]5x[/tex].
So the total number of seats will be [tex]x*5x=5x^2[/tex], and that's equal to 180.
We have
[tex]5x^2=180\\x^2=36[/tex]
And since [tex]x[/tex] has to be a positive number because it represents the number of seats, we know that [tex]x=6[/tex].
So the number of seats in one row is 6.