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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2024-08-21  11
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?
选项 A、15
B、20
C、25
D、30
答案 C
解析 前二十轮胜利者平均吃了15个热狗，一共是300个；前四十轮平均吃了20个，一共是800个。所以后20轮总共吃了500个，平均每轮是25个。
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