Question

A theatre has 11 rows of seats, which have 1 to 10 series.Unmatched numbers have fifteen seats and 16 seats havematched number. How many seats are there in theatre?ਕਸਿਨੇਮਾਹਾਲ ਵਿੱਚ ਸੀਟਾਂ ਦੀਆਂ ਗਿਆਰਾਂ ਕਤਾਰਾਂ ਹਨ ਜਿਨਾਂ ਨੂੰ​

Answer 1

Answer:

Step-by-step explanation:

155

Answer 2

376 seats

Step-by-step explanation:

Given: A theater has 11 rows of seats which have 1 to 10 series. Unmatched numbers have 15 seats and 16 seats have matched number.

Find: How many seats are there in theater?​

Solution:  

sn = 15 + (n-1)²

20th row n = 20

The number of the seats in the theater = 15 + (20-1)² = 376 seats