Question

There is an auditorium with 25 rows of seats. There are 10 seats in the first
row, 12 in the second row, 14 seats in the third row and so on. Find
the number of seats in the 20th row and also find how many total
seats are there in the auditorium?
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Answer 1

Answer:

sorry I do not know the answer

Answer 2

Answer:

Answer - 1) 48

2) 850

Step-by-step explanation:

Seats in 20th row = a20 = a+ 19 d

= 10 + 19(2)

= 10+38

= 48

Total seats = S25= n/2 {2a+(n-1)d}

= 25/2 {2(10) +(25-1)(2)}

=25/2 (20+48)

=25/2 × 68

=850