Hard Mind Puzzle: When Will Cellar Contain 500 Wine Bottles

Answer this hard mind puzzle. Do not use a calculator to test your speed.


Every morning at 10 am, I receive 20 bottles of wine, all of which are stored in the cellar.

Every evening at 7 pm, I remove 10 bottles of wine from my cellar and give them to my friends.

No wine bottles enter or leave my cellar, except at those two times.

On August 1st at 11 am, I had 400 bottles of wine in my cellar.

On what date did my cellar first contain more than 500 bottles of wine?

So were you able to solve the riddle? Leave your answers in the comment section below.

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