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Sharpen your deduction skills with a variety of puzzles, ranging from basic reasoning up to some serious mind-benders. See more

John, Aries, and Joseph are brothers with different ages. Who is the youngest if the following statements are true?

I. Aries is the oldest.

II. Joseph is not the oldest.

III. John is not the youngest.

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- There is only 1 false statement in this list.
- There are only 2 false statements in this list.
- There are only 3 false statements in this list.

Exactly how many false statements are there in the list above?

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You're playing tic tac toe with an opponent who plays optimally. You are \(O\) while your opponent is \(X\).

The game plays as shown:

Where must you place your next mark in order to obtain a winning position?

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The figure shows 3 glasses filled with water and 3 empty glasses (top of figure).

With just your hands, what is the minimum number of glasses you have to pick up in order to make the bottom arrangement?

Note: No sliding of glasses is allowed. You can pour the water from one glass to another.

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