Problem Solve this simple arithmetic by replacing each # sign with a different digit, 1-9, using each digit only once. ## represents a two-digit number. ## x # —– ## + ## = ## Solution When filled in correctly, the equation is: 17 x 4 —– 68 + 25 = 93 If you have a [...]
Problem Three Cowboys Arden, Begley, and Corry compete in a duel. Arden and Begley are both sure shots (they hit their targets 100 percent of the time) while Corry only hits his target 50% of the time. Everybody has perfect knowledge (knows everybody’s percents, knows that everbody knows everybody’s pecents, knows everybody knows that everybody [...]
Problem You are given ten pennies arranged like this picture. Move three of them so that the arrow in the opposite direction. Solution Take the top penny and move it to a new row, in the center, under the bottom row into the following configuration: x x x x [...]
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Problem You are given 10 balls, which are all identical. One ball is either heavier or lighter than the rest. Using a balance three times, can you determine which ball is different, and whether the weight is heavier or lighter? This requires no advanced math or tricky way of using the balance. Think it’s too [...]