Question

please solve this problem ​

Answer 1

Answer:

no. of seats in 15th row=48 seats

no. of seats till 15th row in auditorium=510

Answer 2

Answer:

1)20+30=50 in 15th row

2)20+54=74 in whole auditorium

2 seats are increasing per row so check number of row multiple by 2 and add 20 as base number of chair