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  3. At the eating contest the winner ate an average of 15 hot dogs at the first 20 s

At the eating contest the winner ate an average of 15 hot dogs at the first 20 s

游客2023-10-18  9
问题 At the eating contest the winner ate an average of 15 hot dogs at the first 20 sittings. After a further 20 sittings the average increased to 20 hot dogs. What was the average for the last 20 sittings?
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答案 20
解析 前20轮共吃汉堡300个，40轮下来共吃汉堡800个，则后20轮吃汉堡500个，因此每轮吃25个。
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