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Since my birth I have had a birthday cake with candles, one for each year of my birthdays. To date, I have had 325 candles. How
Since my birth I have had a birthday cake with candles, one for each year of my birthdays. To date, I have had 325 candles. How
admin
2012-05-29
20
问题
Since my birth I have had a birthday cake with candles, one for each year of my birthdays. To date, I have had 325 candles. How old am I?
选项
答案
25
解析
假设当前年龄是n,则此时需要的蜡烛的总数为n(n+1)/2=325,可以解得n=25.
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本试题收录于:
A类竞赛(研究生)题库大学生英语竞赛(NECCS)分类
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A类竞赛(研究生)
大学生英语竞赛(NECCS)
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