Puzzles from Raymond Smullyan

"Professor Smullyan was a serious mathematician, with the publications and the doctorate to prove it. But his greatest legacy may be the...

Math Puzzle 5.

In a rectangular dance hall, how do you place 10 chairs along the walls so that there are equal number of chairs alongside each wall?...

Math Puzzle 4. [few solutions]

Here are a few solutions. Solution 1. Solution 2. Solution 3. When you remove 10 pieces and still keep each row and column even. #math...

Math Puzzle 4.

KEEP IT EVEN ! Take 16 small objects (for example coins, magnets, pieces of paper, etc.) and put them in four rows of 4 as it shown on...

Math Puzzle 3. [solution]

V I + I V = X 6+4=10 #brainteaser #math #puzzle

Math Puzzle 3.

Correct The Error ! With 12 matches form the "equation" shown bellow. V I - I V = I X The "equation" shows (with roman numerals) that...

Math Puzzle 2.

Place three piles of matches (coins, or something small, that you can group together easily) on the table. Make one pile with 11 matches,...

Math Puzzle 1. [solution]

One possible solution. Original: Step one: Step two: Step three: #puzzle

Math Puzzle 1.

Moving Checkers Place 6 checkers on a table in a row, alternating them black, white, black, white, and so on as shown. Leave a vacant...