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

游客2024-08-18  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?

选项 A、15.
B、20
C、25
D、3

答案 C

解析
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