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Question about problem one

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by wlvoh » Thu Feb 08, 2007 12:03 pm
I read the solutions to problem one of the Difficult Math Doc, and do not believe they are correct. The solution says 79, but if you plug in this number, and calculate the sum, you do not get 6320, which is the product of 79 and 80. I used a different formula, and I believe the real answer is n = 159. You can do the calculation to verify that. Any thoughts?

wlvoh
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Re: Question about problem one

by beatthegmat » Thu Feb 15, 2007 8:45 pm
wlvoh wrote:I read the solutions to problem one of the Difficult Math Doc, and do not believe they are correct. The solution says 79, but if you plug in this number, and calculate the sum, you do not get 6320, which is the product of 79 and 80. I used a different formula, and I believe the real answer is n = 159. You can do the calculation to verify that. Any thoughts?

wlvoh
Good discussion about this here: https://www.beatthegmat.com/viewtopic.php?t=406
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