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In which case, to get an even number of buns, he’d have to buy 12 packs of 7 hot dogs and 7 packs of 12 buns, for a total of 84 hot dogs and buns. (Or remove 5 buns from each 12 bun bag.)
Edit: Which means Joey Chestnut could eat his new record of 83 of those dogs in ten minutes and have another left over for Steve Martin!