SOLUTION: An auditorium has 30 rows with 10 seats in the first row, 12 in the second row, 14 in the third row, and so forth. How many seats are in the auditorium?
1170
735
1230
Algebra.Com
Question 1135569: An auditorium has 30 rows with 10 seats in the first row, 12 in the second row, 14 in the third row, and so forth. How many seats are in the auditorium?
1170
735
1230
600
Answer by ikleyn(52873) (Show Source): You can put this solution on YOUR website!
.
They ask you to calculate the sum of the arithmetic progression.
The first term is 10, the number of the terms is 30, the common difference is 2.
Go to the lessons
- Arithmetic progressions
- The proofs of the formulas for arithmetic progressions
- Problems on arithmetic progressions
in this site and learn from there how to calculate the sum of an arithmetic progression.
Then you will be able to do it on your own.
Or see the lesson
- Word problems on arithmetic progressions, Problem 4,
which is your TEMPLATE.
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