[YouTube-API] Forumla for total likes from gd:rating

If I know the number of ratings and the average rating, is it possible
to work out the number of likes?
Everything I've tried doesn't match the YouTube stats.

I was looking at this thread:
http://groups.google.com/group/youtube-api-gdata/browse_thread/thread/e5da208be0053e95

but the formulas used contain all contain information we don't know so
cant use in the the equation.

Thanks
Chris

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