Posted by **shane** on Saturday, November 17, 2012 at 10:06pm.

in the auditorium there are 24 rows of seats. the first second rows have 8 chairs and the third and fourth rows have 10 chairs.if this pattern continues.how many chairs are in the auditorium?

- math -
**Steve**, Saturday, November 17, 2012 at 10:15pm
Since the rows come in pairs, the sequence looks like

8 8 10 10 12 12 ...

SO, considering the nth pair of rows, they have 12+4n seats together.

In 24 rows, there are 12 pairs, so

the 12th pair has 12+48 = 60 seats

the sum is

12/2 (8+60) = 6*68 = 408 seats

## Answer this Question

## Related Questions

- Calculus - Chairs in an auditorium are arranged in rows in such a way that the ...
- math - Organizer of school graduation does have three sections of chairs. 1120 ...
- math - there are 6 rows with 18 chairs in each row. in the center of the chairs...
- math - bryan is setting chairs in rows for a graduation ceremony. He has 50 ...
- algebra - alexis and martin helped the school set chairs in rows for an asembly...
- math - Organisers for a polytechnic graduation has three sections of chairs to ...
- arithmetic - An auditorium has 20 rows of seats.These are 20 seats in the first ...
- math - henry was setting up 18 chairs he wanted to make rows so all of the chais...
- Math - An auditorium has 30 rows of seats. It has 20 seats on the first row, 24 ...
- math - An auditorium has 30 rows with 10 seats in the first row, 12 in the ...

More Related Questions