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Tricky Math Logic Problem

Tricky Math Logic Problem - 26 November

A girl was fond of collecting rare stamps. When she was twenty years old, she bought a box to collect her stamps. On her every birthday, she put 250 stamps in it and her sister who was also fond of collecting stamps took out 50 stamps from it on her birthday. The girl met an accident when she was 60 years old. When her box was opened, there were only 500 stamps in it.

How is it possible logically ?

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  1. This comment has been removed by the author.

  2. First gal's bday was on 29th feb... so she collected 250*10 (2500) stamps in 40 years because her bday comes in once a year. And her sister's bday comes on every year so she collected out 50*40(2000) stamps from the box.
    so after 40 years when 1st gal was 60 yrs old total stams were remaing 500 only.

  3. May be her box has been opened on her 21st birthday, so 250 stamps (on 20th b'day) + 250 stamps (on 21st b'day) =500 stamps.Because it is not mentioned that when she met with an accident after that the box has been opened.