The solution to the logic puzzle indicates that Mr. Ransick teaches 8th grade based on the provided constraints.
Mr. Wilhelm teaches 6th grade, Mr. Ransick teaches 8th grade, and Mrs. Johnson teaches 10th grade based on the given conditions. As Mr. Ransick's students are older than Mr. Wilhelm's, and Mr. Ransick doesn't teach 10th grade, the answer is that Mr. Ransick teaches 8th grade.
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