Identify relevant information, ignore distractors, and choose an appropriate operation or representation for a contextual problem.
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Problem
A library needs the number of additional shelves for \(126~\text{new}~\text{books}\) when each shelf holds \(30\). Shelves are blue, books arrive next Tuesday, and the number of empty shelves already available was not recorded. Classify \(\text{all}~\text{facts}\) as relevant, irrelevant, or missing.
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