2. 外语
  3. 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

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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?
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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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