SOLUTION: A stack of poles has 70 poles in the bottom row, 68 poles in the next row, and so on, with 6 poles in the top row. How many poles are there in the stack?

Question 1104821: A stack of poles has 70 poles in the bottom row, 68 poles in the next row, and so on, with 6 poles in the top row. How many poles are there in the stack?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39620)   (Show Source): You can put this solution on YOUR website!
, the general term for arithmetic sequence

Solve for n, the number of rows

Total of poles in ALL the rows?
-----based on formula for sum of arithmetic sequence

Answer by ikleyn(52803)   (Show Source): You can put this solution on YOUR website!
.
See the lesson
    - Word problems on arithmetic progressions
in this site.

---------------
There is a bunch of lessons on arithmetic progressions in this site
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
    - Chocolate bars and arithmetic progressions
    - Mathematical induction and arithmetic progressions
    - One characteristic property of arithmetic progressions
    - Solved problems on arithmetic progressions

Also, you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic
"Arithmetic progressions".

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