SOLUTION: The first term of an arithmetic progression is 8. The sum of the first 10 terms of this progression divided by the sum of the first 5 terms is 3.25. How many terms of this progres

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Question 823778: The first term of an arithmetic progression is 8. The sum of the first 10 terms of this progression
divided by the sum of the first 5 terms is 3.25. How many terms of this progression add up
to 1720?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
That is solved for sum = 1620, not 1720 here:

http://www.algebra.com/cgi-bin/jump-to-question.mpl?question=495769

There is no solution for 1720.  That is a typo, the 1720 must be 1620.

If you try to use 1720, the answer comes out with n as a fraction
and the number of terms cannot be a fraction.

Edwin