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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
游客
2023-10-20
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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?
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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