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Posted by Moby Dick
on 23/9/2009, 10:59 pm, in reply to "Carpets"
I'm going to guess at 226.
Apologies for sloppy work - just got back from a night at the pub - lots of lovely cider! 
Hope the work below makes some sense to somebody somewhere...
(%i6) solve(4*7^2 + 2*7*x + 2*7*y = 2*11*x + 2*11*(y - 2*11), [x, y]);
(%o6) [[x = 85-%r2,y = %r2]]
Define a function for x and y:
ex(why) := 85 - why;
Resolve the perimeter:
(%i12) solve(solution = 2 * (n + 2*7) + 2 * (ex(n) + 2*7), solution);
(%o12) [solution = 226]
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