You are correct that 105.5 lbs is closer to 47.95 kg than to 47.7 kg. Is that the entire question? If there was more to the question, then it is possible that there was a mistake that had nothing to do with that specific division. Is this a high school or college class? If it is a high school class, then tell your parents and they can help you figure it out. If it is a college class, then bring the issue to the dean of the department.