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Maths riddle

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pinkflamingo | 23:06 Sat 10th Feb 2007 | Quizzes & Puzzles
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Can anyone help me solve this riddle?

As my birthday approaches I start to collect leaves - a little bizarre perhaps, but I enjoy it! On the first day of the month I collect one leaf, on the second day I collect two and so on. So by my birthday I will have collected 276 leaves altogether. On which day of the month is my birthday?
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The 8th

No that comes to 255
I get it - you collect 1 then 2 then 3

I thought you meant 1 then 2 then 4

23rd
The 23rd

24th
23rd
Question Author
Thanks everyone.
Formula is n(n+1)/2, so 276 points to day 23
I would think the key to this are the words "so by my birthday,I WILLhave collected" But then agen!

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