Answer:
125
Step-by-step explanation:
arithmetic sequence : aₓ=a₁+(x−1)d.
a1=22 because that is the first row.
d is 2 because that what is being added to all
x is the number of rows
aₓ is the number of seats in row x
270=22+(x-1)2
270=22+2x-2
270=2x+20
250=2x
125=x