Let us assume Gary sat at the left edge of the table. Imagine looking at the friends from behind so they are facing the table.
It is assumed that Bill is sitting on the right of Gary.
Next we put Tom on the right of Bill and Mike on the right of Tom.
Gary is at the edge of the table and Howard is sitting in the third seat from Bill, so Howard is sitting towards the right of Mike.
Gary is sitting in the third seat from Mike this means that Tom is sitting at the right of Bill.
So, from the left the seating arrangement is Gary, Bill, Tom Mike and Howard.
Hence, Bill is sitting on the other side of Tom.
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