There is an auditorium with 27 rows of seats. There are 20 seats in the first row, 22 seats in the second row, 24 seats in the third row and so on. Find the number of seats in the 15th row and also find how many total seats are there in the ...

There is an auditorium with 27 rows of seats. There are 20 seats in the first row, 22 seats in the second row, 24 seats in the third row and so on. Find the number of seats in the 15th row and also find how many total seats are there in the auditorium?

Doubtly Asked 24 Oct 2026 Save WhatsApp Report

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Answer: 48 seats in the 15th row; 1242 seats in all

\(a = 20\), \(d = 2\).

\[t_{15} = 20 + 14(2) = 48\]\[S_{27} = \frac{27}{2}[40 + 26(2)]\]\[= \frac{27}{2} \times 92 = 1242\]

Doubtly AI · 24 Oct 2026 AI-verified · Oct 2026 Report

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There is an auditorium with 27 rows of seats. There are 20 seats in the first row, 22 seats in the second row, 24 seats in the third row and so on. Find the number of seats in the 15th row and also find how many total seats are there in the ...

1 answer

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