January/February 2007 CPE Puzzler

Always and Never It's always 1 to 6, It's always 15 to 20, It's always 5, But it's never 21, Unless it's flying. What is it?

Answer: A dice.

An explanation:
"It's always 1 to 6": the numbers on the faces of the dice,
"It's always 15 to 20": the sum of the exposed faces when the dice comes to rest after being thrown,
"It's always 5": the number of exposed faces when the dice is at rest,
"But it's never 21": the sum of the exposed faces is never 21 when the dice is at rest,
"Unless it's flying": the sum of all exposed faces when the dice is flying is 21 (1 + 2 + 3 + 4 + 5 + 6).

Source: www.theproblemsite.com

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