Posted by Lexi on Tuesday, September 30, 2008 at 12:35am.
The answer is d=25; N is any of 7, 32, 57, 82, 107, 132 etc etc. It was set up in a spreadsheet and arrived at by trial and error, so just knowing the answer probably won't get many marks. I'd be interested to know if anyone else can produce a formula for deriving the solution algebraically - because I can't see how to do it either.
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