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Sandglass

We have 2 sandglasses that one of them pours all the sands in 7 minutes and another in 11 minutes. 

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How can we cook an egg in 15 minutes by using these 2 sandglasses?

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How Many Birds?!

A group of birds are flying in the sky.A butterfly sees them and asks:How many are you?!The leader of the birds answers:"We and we and half of us, half of our half, if you come with us, we would be 100!!"...Now please you answer!How many are the bird

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Numbers Puzzle

Hello My Smart Friends :)How are you?Do you agree with new puzzles?Ok!Let's see what we have here.Please answer these 3 questions:1- What is the only number whose number of letters in the name equals the number?2- What is the only number which has it

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