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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
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2023-10-18
21
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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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25
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