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问答题
At the beer-drinking contest the winner drank an average of 10 bottles of beer at the first 20 rounds. After a further 20 rounds the average increased to 15 bottles. What is the average for the last 20 rounds?
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解析：
在前20轮中胜者平均喝10瓶酒，共喝200瓶。再过20轮后平均喝15瓶，即共喝了40×15=600瓶。故，后20轮喝了400瓶，胜者平均喝20瓶。
在前20轮中胜者平均喝10瓶酒，共喝200瓶。再过20轮后平均喝15瓶，即共喝了40×15=600瓶。故，后20轮喝了400瓶，胜者平均喝20瓶。
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