Henry is hanging posters and using either 2 or 3 pieces of tape. If he uses a total of 47 pieces of tape to hang 19 posters, how many posters needed 3 pieces of tape?

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Henry is hanging posters and using either 2 or 3 pieces of tape. If he uses a total of 47 pieces of tape to hang 19 posters, how many posters needed 3 pieces of tape?