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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2024-08-17  38
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 25
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