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You have 12 identical-looking balls, but one of them is either heavier or lighter than the rest. You have a balance scale that you can use only three times.

How can you determine which ball is the different one and whether it is heavier or lighter? Answer: Here’s how you can determine the odd ball and whether it is heavier or lighter in three weighings: First Weighing: Divide the 12 balls into three groups of 4 balls each: Group A, Group B, and Group C. Weigh Group A against …

In a small town, there are five houses in a row, each painted a different color. Each house is occupied by a person of a different nationality. Each homeowner drinks a different beverage, smokes a different brand of cigar, and keeps a different pet.

Here are some additional clues: The Brit lives in the red house. The Swede keeps dogs as pets. The Dane drinks tea. The green house is immediately to the left of the white house. The green house’s owner drinks coffee. The person who smokes Pall Mall rears birds. The owner of the yellow house smokes Dunhill. The man living in …