The correct preposition in this context is "on". The phrase "meditating on the problem" is commonly used to mean thinking deeply or reflecting on something.
He was meditating _____ the problem.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.