COLLECTING LEAVES!!! - ANSWER

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 1 leaf, on the second day I collect 2 leaves, the third day I collect 3 leaves, and so on.

By my birthday I will have collected 276 leaves altogether. On which day of the month is my birthday?

 Answer:

 On the 23rd.

276 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 + 21 + 22 + 23.

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